51009555091 has 12 divisors (see below), whose sum is σ = 56245268016. Its totient is φ = 46226003120.

The previous prime is 51009555019. The next prime is 51009555119. The reversal of 51009555091 is 19055590015.

It is not a de Polignac number, because 51009555091 - 2²⁷ = 50875337363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51009555001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 626575 + ... + 703288.

It is an arithmetic number, because the mean of its divisors is an integer number (4687105668).

Almost surely, 2^51009555091 is an apocalyptic number.

51009555091 is a deficient number, since it is larger than the sum of its proper divisors (5235712925).

51009555091 is a wasteful number, since it uses less digits than its factorization.

51009555091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330202 (or 1330191 counting only the distinct ones).

The product of its (nonzero) digits is 50625, while the sum is 40.

The spelling of 51009555091 in words is "fifty-one billion, nine million, five hundred fifty-five thousand, ninety-one".