51045332431 has 4 divisors (see below), whose sum is σ = 51550731864. Its totient is φ = 50539933000.

The previous prime is 51045332419. The next prime is 51045332447. The reversal of 51045332431 is 13423354015.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51045332431 - 2⁵ = 51045332399 is a prime.

It is a super-2 number, since 2×51045332431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51045332393 and 51045332402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51045332231) 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, 252699565 + ... + 252699766.

It is an arithmetic number, because the mean of its divisors is an integer number (12887682966).

Almost surely, 2^51045332431 is an apocalyptic number.

51045332431 is a deficient number, since it is larger than the sum of its proper divisors (505399433).

51045332431 is a wasteful number, since it uses less digits than its factorization.

51045332431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505399432.

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 51045332431 its reverse (13423354015), we get a palindrome (64468686446).

The spelling of 51045332431 in words is "fifty-one billion, forty-five million, three hundred thirty-two thousand, four hundred thirty-one".