51431320 has 32 divisors (see below), whose sum is σ = 117028800. Its totient is φ = 20339968.

The previous prime is 51431293. The next prime is 51431327. The reversal of 51431320 is 2313415.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51431327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3664 + ... + 10783.

It is an arithmetic number, because the mean of its divisors is an integer number (3657150).

Almost surely, 2^51431320 is an apocalyptic number.

It is an amenable number.

51431320 is an abundant number, since it is smaller than the sum of its proper divisors (65597480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51431320 is a wasteful number, since it uses less digits than its factorization.

51431320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14547 (or 14543 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 51431320 is about 7171.5632884330. The cubic root of 51431320 is about 371.8854813796.

Adding to 51431320 its reverse (2313415), we get a palindrome (53744735).

The spelling of 51431320 in words is "fifty-one million, four hundred thirty-one thousand, three hundred twenty".