51531044420 has 48 divisors (see below), whose sum is σ = 110157334896. Its totient is φ = 20243520000.

The previous prime is 51531044417. The next prime is 51531044533. The reversal of 51531044420 is 2444013515.

It can be written as a sum of positive squares in 8 ways, for example, as 172607044 + 51358437376 = 13138^2 + 226624^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 774470 + ... + 838370.

It is an arithmetic number, because the mean of its divisors is an integer number (2294944477).

Almost surely, 2^51531044420 is an apocalyptic number.

It is an amenable number.

51531044420 is an abundant number, since it is smaller than the sum of its proper divisors (58626290476).

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

51531044420 is a wasteful number, since it uses less digits than its factorization.

51531044420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64632 (or 64630 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 51531044420 its reverse (2444013515), we get a palindrome (53975057935).

The spelling of 51531044420 in words is "fifty-one billion, five hundred thirty-one million, forty-four thousand, four hundred twenty".