51932908391 has 16 divisors (see below), whose sum is σ = 64155067200. Its totient is φ = 40937004288.

The previous prime is 51932908387. The next prime is 51932908421. The reversal of 51932908391 is 19380923915.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51932908391 - 2² = 51932908387 is a prime.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51932908361) 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 15 ways as a sum of consecutive naturals, for example, 1036286 + ... + 1085243.

It is an arithmetic number, because the mean of its divisors is an integer number (4009691700).

Almost surely, 2^51932908391 is an apocalyptic number.

51932908391 is a deficient number, since it is larger than the sum of its proper divisors (12222158809).

51932908391 is a wasteful number, since it uses less digits than its factorization.

51932908391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121818.

The product of its (nonzero) digits is 524880, while the sum is 50.

The spelling of 51932908391 in words is "fifty-one billion, nine hundred thirty-two million, nine hundred eight thousand, three hundred ninety-one".