51131306773505 has 32 divisors (see below), whose sum is σ = 71313283872000. Its totient is φ = 34466323479552.

The previous prime is 51131306773493. The next prime is 51131306773507. The reversal of 51131306773505 is 50537760313115.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51131306773505 - 2¹² = 51131306769409 is a prime.

It is a super-2 number, since 2×51131306773505² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51131306773505.

It is not an unprimeable number, because it can be changed into a prime (51131306773507) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86122349 + ... + 86714021.

It is an arithmetic number, because the mean of its divisors is an integer number (2228540121000).

Almost surely, 2^{51131306773505} is an apocalyptic number.

It is an amenable number.

51131306773505 is a deficient number, since it is larger than the sum of its proper divisors (20181977098495).

51131306773505 is a wasteful number, since it uses less digits than its factorization.

51131306773505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633593.

The product of its (nonzero) digits is 992250, while the sum is 47.

The spelling of 51131306773505 in words is "fifty-one trillion, one hundred thirty-one billion, three hundred six million, seven hundred seventy-three thousand, five hundred five".