72831251 has 2 divisors, whose sum is σ = 72831252. Its totient is φ = 72831250.

The previous prime is 72831233. The next prime is 72831257. The reversal of 72831251 is 15213827.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72831251 is a prime.

It is a super-2 number, since 2×72831251² = 10608782244450002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72831257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36415625 + 36415626.

It is an arithmetic number, because the mean of its divisors is an integer number (36415626).

Almost surely, 2^72831251 is an apocalyptic number.

72831251 is a deficient number, since it is larger than the sum of its proper divisors (1).

72831251 is an equidigital number, since it uses as much as digits as its factorization.

72831251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 29.

The square root of 72831251 is about 8534.1227434341. The cubic root of 72831251 is about 417.6116349614.

The spelling of 72831251 in words is "seventy-two million, eight hundred thirty-one thousand, two hundred fifty-one".