261684172 has 6 divisors (see below), whose sum is σ = 457947308. Its totient is φ = 130842084.

The previous prime is 261684167. The next prime is 261684191. The reversal of 261684172 is 271486162.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32710518 + ... + 32710525.

Almost surely, 2^261684172 is an apocalyptic number.

It is an amenable number.

261684172 is a deficient number, since it is larger than the sum of its proper divisors (196263136).

261684172 is a wasteful number, since it uses less digits than its factorization.

261684172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65421047 (or 65421045 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 261684172 is about 16176.6551548829. The cubic root of 261684172 is about 639.6255720016.

The spelling of 261684172 in words is "two hundred sixty-one million, six hundred eighty-four thousand, one hundred seventy-two".