51531412 has 24 divisors (see below), whose sum is σ = 91634760. Its totient is φ = 25353600.

The previous prime is 51531407. The next prime is 51531413. The reversal of 51531412 is 21413515.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 21566736 + 29964676 = 4644^2 + 5474^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51531413) 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, 92238 + ... + 92794.

It is an arithmetic number, because the mean of its divisors is an integer number (3818115).

Almost surely, 2^51531412 is an apocalyptic number.

It is an amenable number.

51531412 is a deficient number, since it is larger than the sum of its proper divisors (40103348).

51531412 is a wasteful number, since it uses less digits than its factorization.

51531412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891 (or 889 counting only the distinct ones).

The product of its digits is 600, while the sum is 22.

The square root of 51531412 is about 7178.5382913237. The cubic root of 51531412 is about 372.1265707969.

Adding to 51531412 its reverse (21413515), we get a palindrome (72944927).

The spelling of 51531412 in words is "fifty-one million, five hundred thirty-one thousand, four hundred twelve".