261140022 has 144 divisors (see below), whose sum is σ = 700618464. Its totient is φ = 69696000.

The previous prime is 261140021. The next prime is 261140023. The reversal of 261140022 is 220041162.

261140022 is a `hidden beast` number, since 261 + 1 + 400 + 2 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (261140021) and next prime (261140023).

It is a super-2 number, since 2×261140022² = 136388222180320968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 261139977 and 261140004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261140021) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 651022 + ... + 651422.

It is an arithmetic number, because the mean of its divisors is an integer number (4865406).

Almost surely, 2^261140022 is an apocalyptic number.

261140022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 261140022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (350309232).

261140022 is an abundant number, since it is smaller than the sum of its proper divisors (439478442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261140022 is a wasteful number, since it uses less digits than its factorization.

261140022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 261140022 is about 16159.8274124447. The cubic root of 261140022 is about 639.1819153349.

Adding to 261140022 its reverse (220041162), we get a palindrome (481181184).

The spelling of 261140022 in words is "two hundred sixty-one million, one hundred forty thousand, twenty-two".