261005022 has 12 divisors (see below), whose sum is σ = 565510920. Its totient is φ = 87001668.

The previous prime is 261004973. The next prime is 261005099. The reversal of 261005022 is 220500162.

261005022 is a `hidden beast` number, since 2 + 610 + 0 + 50 + 2 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 14500279 = 261005022 / (2 + 6 + 1 + 0 + 0 + 5 + 0 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 261004986 and 261005004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7250122 + ... + 7250157.

It is an arithmetic number, because the mean of its divisors is an integer number (47125910).

Almost surely, 2^261005022 is an apocalyptic number.

261005022 is an abundant number, since it is smaller than the sum of its proper divisors (304505898).

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

261005022 is a wasteful number, since it uses less digits than its factorization.

261005022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14500287 (or 14500284 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 261005022 is about 16155.6498476539. The cubic root of 261005022 is about 639.0717516613.

Adding to 261005022 its reverse (220500162), we get a palindrome (481505184).

The spelling of 261005022 in words is "two hundred sixty-one million, five thousand, twenty-two".