261132656 has 20 divisors (see below), whose sum is σ = 532573800. Its totient is φ = 123694272.

The previous prime is 261132647. The next prime is 261132659. The reversal of 261132656 is 656231162.

It is a super-2 number, since 2×261132656² = 136380528059228672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261132659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 429191 + ... + 429798.

It is an arithmetic number, because the mean of its divisors is an integer number (26628690).

Almost surely, 2^261132656 is an apocalyptic number.

It is an amenable number.

261132656 is an abundant number, since it is smaller than the sum of its proper divisors (271441144).

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

261132656 is a wasteful number, since it uses less digits than its factorization.

261132656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859016 (or 859010 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 261132656 is about 16159.5994999876. The cubic root of 261132656 is about 639.1759054578.

The spelling of 261132656 in words is "two hundred sixty-one million, one hundred thirty-two thousand, six hundred fifty-six".