261158572 has 24 divisors (see below), whose sum is σ = 497674800. Its totient is φ = 119439936.

The previous prime is 261158567. The next prime is 261158581. The reversal of 261158572 is 275851162.

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, 57043 + ... + 61450.

It is an arithmetic number, because the mean of its divisors is an integer number (20736450).

Almost surely, 2^261158572 is an apocalyptic number.

It is an amenable number.

261158572 is a deficient number, since it is larger than the sum of its proper divisors (236516228).

261158572 is a wasteful number, since it uses less digits than its factorization.

261158572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118545 (or 118543 counting only the distinct ones).

The product of its digits is 33600, while the sum is 37.

The square root of 261158572 is about 16160.4013564020. The cubic root of 261158572 is about 639.1970496725.

The spelling of 261158572 in words is "two hundred sixty-one million, one hundred fifty-eight thousand, five hundred seventy-two".