51131440524 has 24 divisors (see below), whose sum is σ = 122081270080. Its totient is φ = 16647445584.

The previous prime is 51131440519. The next prime is 51131440561. The reversal of 51131440524 is 42504413115.

It is a super-2 number, since 2×51131440524² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51131440491 and 51131440500.

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 7 ways as a sum of consecutive naturals, for example, 49545454 + ... + 49546485.

Almost surely, 2^51131440524 is an apocalyptic number.

It is an amenable number.

51131440524 is an abundant number, since it is smaller than the sum of its proper divisors (70949829556).

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

51131440524 is a wasteful number, since it uses less digits than its factorization.

51131440524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99091989 (or 99091987 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 51131440524 its reverse (42504413115), we get a palindrome (93635853639).

The spelling of 51131440524 in words is "fifty-one billion, one hundred thirty-one million, four hundred forty thousand, five hundred twenty-four".