51215312999 has 2 divisors, whose sum is σ = 51215313000. Its totient is φ = 51215312998.

The previous prime is 51215312977. The next prime is 51215313049. The reversal of 51215312999 is 99921351215.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51215312999 - 2²⁸ = 50946877543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51215312969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25607656499 + 25607656500.

It is an arithmetic number, because the mean of its divisors is an integer number (25607656500).

Almost surely, 2^51215312999 is an apocalyptic number.

51215312999 is a deficient number, since it is larger than the sum of its proper divisors (1).

51215312999 is an equidigital number, since it uses as much as digits as its factorization.

51215312999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 218700, while the sum is 47.

The spelling of 51215312999 in words is "fifty-one billion, two hundred fifteen million, three hundred twelve thousand, nine hundred ninety-nine".