172371381 has 48 divisors (see below), whose sum is σ = 301256064. Its totient is φ = 85542912.

The previous prime is 172371379. The next prime is 172371383. The reversal of 172371381 is 183173271.

172371381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (172371379) and next prime (172371383).

It is not a de Polignac number, because 172371381 - 2¹ = 172371379 is a prime.

It is a super-2 number, since 2×172371381² = 59423785975694322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172371383) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58905 + ... + 61761.

It is an arithmetic number, because the mean of its divisors is an integer number (6276168).

Almost surely, 2^172371381 is an apocalyptic number.

It is an amenable number.

172371381 is a deficient number, since it is larger than the sum of its proper divisors (128884683).

172371381 is a wasteful number, since it uses less digits than its factorization.

172371381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2910 (or 2897 counting only the distinct ones).

The product of its digits is 7056, while the sum is 33.

The square root of 172371381 is about 13129.0281818572. The cubic root of 172371381 is about 556.5297525442.

The spelling of 172371381 in words is "one hundred seventy-two million, three hundred seventy-one thousand, three hundred eighty-one".