51512255209 has 2 divisors, whose sum is σ = 51512255210. Its totient is φ = 51512255208.

The previous prime is 51512255183. The next prime is 51512255219. The reversal of 51512255209 is 90255221515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34402830400 + 17109424809 = 185480^2 + 130803^2 .

It is a cyclic number.

It is not a de Polignac number, because 51512255209 - 2²¹ = 51510158057 is a prime.

It is not a weakly prime, because it can be changed into another prime (51512255219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25756127604 + 25756127605.

It is an arithmetic number, because the mean of its divisors is an integer number (25756127605).

Almost surely, 2^51512255209 is an apocalyptic number.

It is an amenable number.

51512255209 is a deficient number, since it is larger than the sum of its proper divisors (1).

51512255209 is an equidigital number, since it uses as much as digits as its factorization.

51512255209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45000, while the sum is 37.

The spelling of 51512255209 in words is "fifty-one billion, five hundred twelve million, two hundred fifty-five thousand, two hundred nine".