72131173 has 4 divisors (see below), whose sum is σ = 72282240. Its totient is φ = 71980108.

The previous prime is 72131159. The next prime is 72131231. The reversal of 72131173 is 37113127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72131173 is a prime.

It is a super-2 number, since 2×72131173² = 10405812236711858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72131273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74815 + ... + 75772.

It is an arithmetic number, because the mean of its divisors is an integer number (18070560).

Almost surely, 2^72131173 is an apocalyptic number.

It is an amenable number.

72131173 is a deficient number, since it is larger than the sum of its proper divisors (151067).

72131173 is a wasteful number, since it uses less digits than its factorization.

72131173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151066.

The product of its digits is 882, while the sum is 25.

The square root of 72131173 is about 8493.0073001264. The cubic root of 72131173 is about 416.2692510042.

The spelling of 72131173 in words is "seventy-two million, one hundred thirty-one thousand, one hundred seventy-three".