261313530 has 32 divisors (see below), whose sum is σ = 628435584. Its totient is φ = 69541056.

The previous prime is 261313529. The next prime is 261313531. The reversal of 261313530 is 35313162.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (261313529) and next prime (261313531).

It is a super-2 number, since 2×261313530² = 136569521922121800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261313530.

It is not an unprimeable number, because it can be changed into a prime (261313531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6432 + ... + 23748.

It is an arithmetic number, because the mean of its divisors is an integer number (19638612).

Almost surely, 2^261313530 is an apocalyptic number.

261313530 is an abundant number, since it is smaller than the sum of its proper divisors (367122054).

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

261313530 is a wasteful number, since it uses less digits than its factorization.

261313530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17830.

The product of its (nonzero) digits is 1620, while the sum is 24.

The square root of 261313530 is about 16165.1950189288. The cubic root of 261313530 is about 639.3234468418.

Adding to 261313530 its reverse (35313162), we get a palindrome (296626692).

The spelling of 261313530 in words is "two hundred sixty-one million, three hundred thirteen thousand, five hundred thirty".