72132331 has 4 divisors (see below), whose sum is σ = 72231472. Its totient is φ = 72033192.

The previous prime is 72132329. The next prime is 72132337. The reversal of 72132331 is 13323127.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 72132331 - 2¹ = 72132329 is a prime.

It is a super-2 number, since 2×72132331² = 10406146350987122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72132337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48471 + ... + 49936.

It is an arithmetic number, because the mean of its divisors is an integer number (18057868).

Almost surely, 2^72132331 is an apocalyptic number.

72132331 is a deficient number, since it is larger than the sum of its proper divisors (99141).

72132331 is an equidigital number, since it uses as much as digits as its factorization.

72132331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99140.

The product of its digits is 756, while the sum is 22.

The square root of 72132331 is about 8493.0754735843. The cubic root of 72132331 is about 416.2714785996.

Adding to 72132331 its reverse (13323127), we get a palindrome (85455458).

The spelling of 72132331 in words is "seventy-two million, one hundred thirty-two thousand, three hundred thirty-one".