51285159209 has 2 divisors, whose sum is σ = 51285159210. Its totient is φ = 51285159208.

The previous prime is 51285159199. The next prime is 51285159221. The reversal of 51285159209 is 90295158215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50379149209 + 906010000 = 224453^2 + 30100^2 .

It is a cyclic number.

It is not a de Polignac number, because 51285159209 - 2²⁸ = 51016723753 is a prime.

It is not a weakly prime, because it can be changed into another prime (51285159229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25642579604 + 25642579605.

It is an arithmetic number, because the mean of its divisors is an integer number (25642579605).

Almost surely, 2^51285159209 is an apocalyptic number.

It is an amenable number.

51285159209 is a deficient number, since it is larger than the sum of its proper divisors (1).

51285159209 is an equidigital number, since it uses as much as digits as its factorization.

51285159209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324000, while the sum is 47.

The spelling of 51285159209 in words is "fifty-one billion, two hundred eighty-five million, one hundred fifty-nine thousand, two hundred nine".