51494768091 has 32 divisors (see below), whose sum is σ = 82213125120. Its totient is φ = 31667399712.

The previous prime is 51494768071. The next prime is 51494768099. The reversal of 51494768091 is 19086749415.

51494768091 is a `hidden beast` number, since 5 + 1 + 4 + 9 + 476 + 80 + 91 = 666.

It is not a de Polignac number, because 51494768091 - 2¹⁵ = 51494735323 is a prime.

It is a super-2 number, since 2×51494768091² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51494768099) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 471070 + ... + 569996.

It is an arithmetic number, because the mean of its divisors is an integer number (2569160160).

Almost surely, 2^51494768091 is an apocalyptic number.

51494768091 is a deficient number, since it is larger than the sum of its proper divisors (30718357029).

51494768091 is a wasteful number, since it uses less digits than its factorization.

51494768091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100432 (or 100426 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 51494768091 in words is "fifty-one billion, four hundred ninety-four million, seven hundred sixty-eight thousand, ninety-one".