51307236513 has 36 divisors (see below), whose sum is σ = 82876847508. Its totient is φ = 31573631520.

The previous prime is 51307236503. The next prime is 51307236527. The reversal of 51307236513 is 31563270315.

51307236513 is a `hidden beast` number, since 5 + 130 + 7 + 2 + 3 + 6 + 513 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4988879424 + 46318357089 = 70632^2 + 215217^2 .

It is not a de Polignac number, because 51307236513 - 2²⁰ = 51306187937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51307236503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 215478 + ... + 386063.

It is an arithmetic number, because the mean of its divisors is an integer number (2302134653).

Almost surely, 2^51307236513 is an apocalyptic number.

It is an amenable number.

51307236513 is a deficient number, since it is larger than the sum of its proper divisors (31569610995).

51307236513 is an frugal number, since it uses more digits than its factorization.

51307236513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601578 (or 601557 counting only the distinct ones).

The product of its (nonzero) digits is 56700, while the sum is 36.

The spelling of 51307236513 in words is "fifty-one billion, three hundred seven million, two hundred thirty-six thousand, five hundred thirteen".