164972138 has 4 divisors (see below), whose sum is σ = 247458210. Its totient is φ = 82486068.

The previous prime is 164972107. The next prime is 164972141. The reversal of 164972138 is 831279461.

164972138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831279461 = 29 ⋅28664809.

It can be written as a sum of positive squares in only one way, i.e., 93180409 + 71791729 = 9653^2 + 8473^2 .

It is a junction number, because it is equal to n+sod(n) for n = 164972095 and 164972104.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41243033 + ... + 41243036.

Almost surely, 2^164972138 is an apocalyptic number.

164972138 is a deficient number, since it is larger than the sum of its proper divisors (82486072).

164972138 is an equidigital number, since it uses as much as digits as its factorization.

164972138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82486071.

The product of its digits is 72576, while the sum is 41.

The square root of 164972138 is about 12844.1480059987. The cubic root of 164972138 is about 548.4497812468.

The spelling of 164972138 in words is "one hundred sixty-four million, nine hundred seventy-two thousand, one hundred thirty-eight".