51572239 has 2 divisors, whose sum is σ = 51572240. Its totient is φ = 51572238.

The previous prime is 51572173. The next prime is 51572249. The reversal of 51572239 is 93227515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51572239 - 2²³ = 43183631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51572249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25786119 + 25786120.

It is an arithmetic number, because the mean of its divisors is an integer number (25786120).

Almost surely, 2^51572239 is an apocalyptic number.

51572239 is a deficient number, since it is larger than the sum of its proper divisors (1).

51572239 is an equidigital number, since it uses as much as digits as its factorization.

51572239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900, while the sum is 34.

The square root of 51572239 is about 7181.3814130709. The cubic root of 51572239 is about 372.2248202619.

It can be divided in two parts, 5157 and 2239, that added together give a square (7396 = 86²).

The spelling of 51572239 in words is "fifty-one million, five hundred seventy-two thousand, two hundred thirty-nine".