72656251 has 2 divisors, whose sum is σ = 72656252. Its totient is φ = 72656250.

The previous prime is 72656237. The next prime is 72656257. The reversal of 72656251 is 15265627.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72656251 - 2¹⁹ = 72131963 is a prime.

It is not a weakly prime, because it can be changed into another prime (72656257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36328125 + 36328126.

It is an arithmetic number, because the mean of its divisors is an integer number (36328126).

Almost surely, 2^72656251 is an apocalyptic number.

72656251 is a deficient number, since it is larger than the sum of its proper divisors (1).

72656251 is an equidigital number, since it uses as much as digits as its factorization.

72656251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 34.

The square root of 72656251 is about 8523.8636192750. The cubic root of 72656251 is about 417.2768855804.

The spelling of 72656251 in words is "seventy-two million, six hundred fifty-six thousand, two hundred fifty-one".