51431003521 has 8 divisors (see below), whose sum is σ = 51909186560. Its totient is φ = 50952935952.

The previous prime is 51431003497. The next prime is 51431003579. The reversal of 51431003521 is 12530013415.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-51431003521 is a prime.

It is a super-2 number, since 2×51431003521² (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 (51431003621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1053376 + ... + 1101118.

It is an arithmetic number, because the mean of its divisors is an integer number (6488648320).

Almost surely, 2^51431003521 is an apocalyptic number.

It is an amenable number.

51431003521 is a deficient number, since it is larger than the sum of its proper divisors (478183039).

51431003521 is a wasteful number, since it uses less digits than its factorization.

51431003521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57735.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 51431003521 its reverse (12530013415), we get a palindrome (63961016936).

The spelling of 51431003521 in words is "fifty-one billion, four hundred thirty-one million, three thousand, five hundred twenty-one".