51431213540 has 24 divisors (see below), whose sum is σ = 123434912832. Its totient is φ = 17633558880.

The previous prime is 51431213539. The next prime is 51431213557. The reversal of 51431213540 is 4531213415.

51431213540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183682766 + ... + 183683045.

It is an arithmetic number, because the mean of its divisors is an integer number (5143121368).

Almost surely, 2^51431213540 is an apocalyptic number.

It is an amenable number.

51431213540 is an abundant number, since it is smaller than the sum of its proper divisors (72003699292).

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

51431213540 is a wasteful number, since it uses less digits than its factorization.

51431213540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367365827 (or 367365825 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 51431213540 its reverse (4531213415), we get a palindrome (55962426955).

The spelling of 51431213540 in words is "fifty-one billion, four hundred thirty-one million, two hundred thirteen thousand, five hundred forty".