172153538 has 4 divisors (see below), whose sum is σ = 258230310. Its totient is φ = 86076768.

The previous prime is 172153523. The next prime is 172153573. The reversal of 172153538 is 835351271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 104305369 + 67848169 = 10213^2 + 8237^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 172153498 and 172153507.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43038383 + ... + 43038386.

Almost surely, 2^172153538 is an apocalyptic number.

172153538 is a deficient number, since it is larger than the sum of its proper divisors (86076772).

172153538 is an equidigital number, since it uses as much as digits as its factorization.

172153538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86076771.

The product of its digits is 25200, while the sum is 35.

The square root of 172153538 is about 13120.7293242411. The cubic root of 172153538 is about 556.2952062237.

The spelling of 172153538 in words is "one hundred seventy-two million, one hundred fifty-three thousand, five hundred thirty-eight".