52172991 has 20 divisors (see below), whose sum is σ = 83934312. Its totient is φ = 32105808.

The previous prime is 52172963. The next prime is 52173007. The reversal of 52172991 is 19927125.

It is not a de Polignac number, because 52172991 - 2¹³ = 52164799 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52172921) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 23721 + ... + 25826.

Almost surely, 2^52172991 is an apocalyptic number.

52172991 is a deficient number, since it is larger than the sum of its proper divisors (31761321).

52172991 is a wasteful number, since it uses less digits than its factorization.

52172991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49572 (or 49563 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 52172991 is about 7223.0873592945. The cubic root of 52172991 is about 373.6645619257.

The spelling of 52172991 in words is "fifty-two million, one hundred seventy-two thousand, nine hundred ninety-one".