51555305531 has 4 divisors (see below), whose sum is σ = 51556261152. Its totient is φ = 51554349912.

The previous prime is 51555305509. The next prime is 51555305567. The reversal of 51555305531 is 13550355515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13550355515 = 5 ⋅2710071103.

It is a cyclic number.

It is not a de Polignac number, because 51555305531 - 2⁶ = 51555305467 is a prime.

It is a super-2 number, since 2×51555305531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51555301531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391715 + ... + 506508.

It is an arithmetic number, because the mean of its divisors is an integer number (12889065288).

Almost surely, 2^51555305531 is an apocalyptic number.

51555305531 is a deficient number, since it is larger than the sum of its proper divisors (955621).

51555305531 is an equidigital number, since it uses as much as digits as its factorization.

51555305531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955620.

The product of its (nonzero) digits is 140625, while the sum is 38.

The spelling of 51555305531 in words is "fifty-one billion, five hundred fifty-five million, three hundred five thousand, five hundred thirty-one".