261937172 has 24 divisors (see below), whose sum is σ = 532465920. Its totient is φ = 110417760.

The previous prime is 261937163. The next prime is 261937187. The reversal of 261937172 is 271739162.

261937172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×261937172² = 137222164150715168, which contains 22 as substring.

It is a congruent number.

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, 74972 + ... + 78387.

It is an arithmetic number, because the mean of its divisors is an integer number (22186080).

Almost surely, 2^261937172 is an apocalyptic number.

It is an amenable number.

261937172 is an abundant number, since it is smaller than the sum of its proper divisors (270528748).

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

261937172 is a wasteful number, since it uses less digits than its factorization.

261937172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153431 (or 153429 counting only the distinct ones).

The product of its digits is 31752, while the sum is 38.

The square root of 261937172 is about 16184.4731764738. The cubic root of 261937172 is about 639.8316386567.

The spelling of 261937172 in words is "two hundred sixty-one million, nine hundred thirty-seven thousand, one hundred seventy-two".