51215634317 has 8 divisors (see below), whose sum is σ = 51522979224. Its totient is φ = 50908419648.

The previous prime is 51215634311. The next prime is 51215634331. The reversal of 51215634317 is 71343651215.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19907516836 + 31308117481 = 141094^2 + 176941^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51215634317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51215634311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 823403 + ... + 883415.

It is an arithmetic number, because the mean of its divisors is an integer number (6440372403).

Almost surely, 2^51215634317 is an apocalyptic number.

It is an amenable number.

51215634317 is a deficient number, since it is larger than the sum of its proper divisors (307344907).

51215634317 is a wasteful number, since it uses less digits than its factorization.

51215634317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65119.

The product of its digits is 75600, while the sum is 38.

The spelling of 51215634317 in words is "fifty-one billion, two hundred fifteen million, six hundred thirty-four thousand, three hundred seventeen".