51031320424 has 32 divisors (see below), whose sum is σ = 109425960000. Its totient is φ = 21855939840.

The previous prime is 51031320377. The next prime is 51031320427. The reversal of 51031320424 is 42402313015.

51031320424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (51031320427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220017 + ... + 387904.

It is an arithmetic number, because the mean of its divisors is an integer number (3419561250).

Almost surely, 2^51031320424 is an apocalyptic number.

It is an amenable number.

51031320424 is an abundant number, since it is smaller than the sum of its proper divisors (58394639576).

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

51031320424 is a wasteful number, since it uses less digits than its factorization.

51031320424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609433 (or 609429 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 51031320424 its reverse (42402313015), we get a palindrome (93433633439).

The spelling of 51031320424 in words is "fifty-one billion, thirty-one million, three hundred twenty thousand, four hundred twenty-four".