172391164 has 24 divisors (see below), whose sum is σ = 343421568. Its totient is φ = 74952240.

The previous prime is 172391147. The next prime is 172391173. The reversal of 172391164 is 461193271.

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, 84162 + ... + 86185.

It is an arithmetic number, because the mean of its divisors is an integer number (14309232).

Almost surely, 2^172391164 is an apocalyptic number.

It is an amenable number.

172391164 is a deficient number, since it is larger than the sum of its proper divisors (171030404).

172391164 is a wasteful number, since it uses less digits than its factorization.

172391164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170385 (or 170383 counting only the distinct ones).

The product of its digits is 9072, while the sum is 34.

The square root of 172391164 is about 13129.7815671092. The cubic root of 172391164 is about 556.5510426348.

The spelling of 172391164 in words is "one hundred seventy-two million, three hundred ninety-one thousand, one hundred sixty-four".