51104640191 has 4 divisors (see below), whose sum is σ = 55750516584. Its totient is φ = 46458763800.

The previous prime is 51104640187. The next prime is 51104640221. The reversal of 51104640191 is 19104640115.

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 51104640191 - 2² = 51104640187 is a prime.

It is a super-2 number, since 2×51104640191² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51104640791) 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, 2322938180 + ... + 2322938201.

It is an arithmetic number, because the mean of its divisors is an integer number (13937629146).

Almost surely, 2^51104640191 is an apocalyptic number.

51104640191 is a deficient number, since it is larger than the sum of its proper divisors (4645876393).

51104640191 is a wasteful number, since it uses less digits than its factorization.

51104640191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4645876392.

The product of its (nonzero) digits is 4320, while the sum is 32.

The spelling of 51104640191 in words is "fifty-one billion, one hundred four million, six hundred forty thousand, one hundred ninety-one".