51010009591 has 4 divisors (see below), whose sum is σ = 52095328992. Its totient is φ = 49924690192.

The previous prime is 51010009577. The next prime is 51010009597. The reversal of 51010009591 is 19590001015.

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 51010009591 - 2⁹ = 51010009079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51010009597) 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, 542659630 + ... + 542659723.

It is an arithmetic number, because the mean of its divisors is an integer number (13023832248).

Almost surely, 2^51010009591 is an apocalyptic number.

51010009591 is a deficient number, since it is larger than the sum of its proper divisors (1085319401).

51010009591 is a wasteful number, since it uses less digits than its factorization.

51010009591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085319400.

The product of its (nonzero) digits is 2025, while the sum is 31.

The spelling of 51010009591 in words is "fifty-one billion, ten million, nine thousand, five hundred ninety-one".