51379842891 has 12 divisors (see below), whose sum is σ = 74181549048. Its totient is φ = 31618364544.

The previous prime is 51379842887. The next prime is 51379842923. The reversal of 51379842891 is 19824897315.

It is not a de Polignac number, because 51379842891 - 2² = 51379842887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51379843891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50669950 + ... + 50670963.

It is an arithmetic number, because the mean of its divisors is an integer number (6181795754).

Almost surely, 2^51379842891 is an apocalyptic number.

51379842891 is a deficient number, since it is larger than the sum of its proper divisors (22801706157).

51379842891 is a wasteful number, since it uses less digits than its factorization.

51379842891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101340942 (or 101340929 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 57.

The spelling of 51379842891 in words is "fifty-one billion, three hundred seventy-nine million, eight hundred forty-two thousand, eight hundred ninety-one".