261522256 has 20 divisors (see below), whose sum is σ = 507418912. Its totient is φ = 130575456.

The previous prime is 261522227. The next prime is 261522269. The reversal of 261522256 is 652225162.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391 + ... + 22873.

Almost surely, 2^261522256 is an apocalyptic number.

It is an amenable number.

261522256 is a deficient number, since it is larger than the sum of its proper divisors (245896656).

261522256 is a wasteful number, since it uses less digits than its factorization.

261522256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23218 (or 23212 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

The square root of 261522256 is about 16171.6497612334. The cubic root of 261522256 is about 639.4936228904.

The spelling of 261522256 in words is "two hundred sixty-one million, five hundred twenty-two thousand, two hundred fifty-six".