51236472239 has 2 divisors, whose sum is σ = 51236472240. Its totient is φ = 51236472238.

The previous prime is 51236472191. The next prime is 51236472251. The reversal of 51236472239 is 93227463215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51236472239 - 2⁸ = 51236471983 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51236472239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51236472269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25618236119 + 25618236120.

It is an arithmetic number, because the mean of its divisors is an integer number (25618236120).

Almost surely, 2^51236472239 is an apocalyptic number.

51236472239 is a deficient number, since it is larger than the sum of its proper divisors (1).

51236472239 is an equidigital number, since it uses as much as digits as its factorization.

51236472239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 44.

The spelling of 51236472239 in words is "fifty-one billion, two hundred thirty-six million, four hundred seventy-two thousand, two hundred thirty-nine".