261091522 has 16 divisors (see below), whose sum is σ = 394474752. Its totient is φ = 129603600.

The previous prime is 261091513. The next prime is 261091531. The reversal of 261091522 is 225190162.

It is an interprime number because it is at equal distance from previous prime (261091513) and next prime (261091531).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247897 + ... + 248947.

It is an arithmetic number, because the mean of its divisors is an integer number (24654672).

Almost surely, 2^261091522 is an apocalyptic number.

261091522 is a deficient number, since it is larger than the sum of its proper divisors (133383230).

261091522 is a wasteful number, since it uses less digits than its factorization.

261091522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1833.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 261091522 is about 16158.3267079237. The cubic root of 261091522 is about 639.1423423859.

The spelling of 261091522 in words is "two hundred sixty-one million, ninety-one thousand, five hundred twenty-two".