51431220321232 has 40 divisors (see below), whose sum is σ = 99795888351776. Its totient is φ = 25677467496576.

The previous prime is 51431220321203. The next prime is 51431220321251. The reversal of 51431220321232 is 23212302213415.

It is a happy number.

It is a super-2 number, since 2×51431220321232² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51431220321194 and 51431220321203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32454103 + ... + 34001929.

Almost surely, 2^{51431220321232} is an apocalyptic number.

It is an amenable number.

51431220321232 is a deficient number, since it is larger than the sum of its proper divisors (48364668030544).

51431220321232 is a wasteful number, since it uses less digits than its factorization.

51431220321232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550915 (or 1550909 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 51431220321232 its reverse (23212302213415), we get a palindrome (74643522534647).

The spelling of 51431220321232 in words is "fifty-one trillion, four hundred thirty-one billion, two hundred twenty million, three hundred twenty-one thousand, two hundred thirty-two".