51131582815 has 16 divisors (see below), whose sum is σ = 61539950592. Its totient is φ = 40784081184.

The previous prime is 51131582813. The next prime is 51131582837. The reversal of 51131582815 is 51828513115.

It is a cyclic number.

It is not a de Polignac number, because 51131582815 - 2¹ = 51131582813 is a prime.

It is a super-2 number, since 2×51131582815² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51131582813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2377842 + ... + 2399248.

It is an arithmetic number, because the mean of its divisors is an integer number (3846246912).

Almost surely, 2^51131582815 is an apocalyptic number.

51131582815 is a deficient number, since it is larger than the sum of its proper divisors (10408367777).

51131582815 is a wasteful number, since it uses less digits than its factorization.

51131582815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22806.

The product of its digits is 48000, while the sum is 40.

The spelling of 51131582815 in words is "fifty-one billion, one hundred thirty-one million, five hundred eighty-two thousand, eight hundred fifteen".