51931136579 has 4 divisors (see below), whose sum is σ = 59349870384. Its totient is φ = 44512402776.

The previous prime is 51931136573. The next prime is 51931136581. The reversal of 51931136579 is 97563113915.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51931136579 - 2¹⁶ = 51931071043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51931136573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3709366892 + ... + 3709366905.

It is an arithmetic number, because the mean of its divisors is an integer number (14837467596).

Almost surely, 2^51931136579 is an apocalyptic number.

51931136579 is a deficient number, since it is larger than the sum of its proper divisors (7418733805).

51931136579 is an equidigital number, since it uses as much as digits as its factorization.

51931136579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7418733804.

The product of its digits is 765450, while the sum is 50.

The spelling of 51931136579 in words is "fifty-one billion, nine hundred thirty-one million, one hundred thirty-six thousand, five hundred seventy-nine".