51500005091 has 4 divisors (see below), whose sum is σ = 52697679672. Its totient is φ = 50302330512.

The previous prime is 51500005043. The next prime is 51500005093. The reversal of 51500005091 is 19050000515.

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 51500005091 - 2¹⁰ = 51500004067 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51500005091.

It is not an unprimeable number, because it can be changed into a prime (51500005093) 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, 598837226 + ... + 598837311.

It is an arithmetic number, because the mean of its divisors is an integer number (13174419918).

Almost surely, 2^51500005091 is an apocalyptic number.

51500005091 is a deficient number, since it is larger than the sum of its proper divisors (1197674581).

51500005091 is a wasteful number, since it uses less digits than its factorization.

51500005091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197674580.

The product of its (nonzero) digits is 1125, while the sum is 26.

The spelling of 51500005091 in words is "fifty-one billion, five hundred million, five thousand, ninety-one".