72228931 has 2 divisors, whose sum is σ = 72228932. Its totient is φ = 72228930.

The previous prime is 72228917. The next prime is 72228943. The reversal of 72228931 is 13982227.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72228931 is a prime.

It is a super-2 number, since 2×72228931² = 10434036946805522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72228031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36114465 + 36114466.

It is an arithmetic number, because the mean of its divisors is an integer number (36114466).

Almost surely, 2^72228931 is an apocalyptic number.

72228931 is a deficient number, since it is larger than the sum of its proper divisors (1).

72228931 is an equidigital number, since it uses as much as digits as its factorization.

72228931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 72228931 is about 8498.7605566930. The cubic root of 72228931 is about 416.4572200325.

The spelling of 72228931 in words is "seventy-two million, two hundred twenty-eight thousand, nine hundred thirty-one".