51031431252 has 36 divisors (see below), whose sum is σ = 130445520660. Its totient is φ = 16819347072.

The previous prime is 51031431203. The next prime is 51031431281. The reversal of 51031431252 is 25213413015.

51031431252 is a `hidden beast` number, since 510 + 3 + 143 + 1 + 2 + 5 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19958908176 + 31072523076 = 141276^2 + 176274^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 7960503 + ... + 7966910.

It is an arithmetic number, because the mean of its divisors is an integer number (3623486685).

Almost surely, 2^51031431252 is an apocalyptic number.

It is an amenable number.

51031431252 is an abundant number, since it is smaller than the sum of its proper divisors (79414089408).

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

51031431252 is a wasteful number, since it uses less digits than its factorization.

51031431252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15927512 (or 15927507 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 51031431252 its reverse (25213413015), we get a palindrome (76244844267).

The spelling of 51031431252 in words is "fifty-one billion, thirty-one million, four hundred thirty-one thousand, two hundred fifty-two".