51313400442 has 48 divisors (see below), whose sum is σ = 117434473728. Its totient is φ = 16167755520.

The previous prime is 51313400431. The next prime is 51313400443. The reversal of 51313400442 is 24400431315.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (51313400443) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 1045303 + ... + 1093290.

It is an arithmetic number, because the mean of its divisors is an integer number (2446551536).

Almost surely, 2^51313400442 is an apocalyptic number.

51313400442 is an abundant number, since it is smaller than the sum of its proper divisors (66121073286).

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

51313400442 is a wasteful number, since it uses less digits than its factorization.

51313400442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2138675 (or 2138672 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 51313400442 its reverse (24400431315), we get a palindrome (75713831757).

The spelling of 51313400442 in words is "fifty-one billion, three hundred thirteen million, four hundred thousand, four hundred forty-two".