51510059591 has 4 divisors (see below), whose sum is σ = 51554813184. Its totient is φ = 51465306000.

The previous prime is 51510059569. The next prime is 51510059639. The reversal of 51510059591 is 19595001515.

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 51510059591 - 2¹⁸ = 51509797447 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 (51510059501) 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, 22375070 + ... + 22377371.

It is an arithmetic number, because the mean of its divisors is an integer number (12888703296).

Almost surely, 2^51510059591 is an apocalyptic number.

51510059591 is a deficient number, since it is larger than the sum of its proper divisors (44753593).

51510059591 is a wasteful number, since it uses less digits than its factorization.

51510059591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44753592.

The product of its (nonzero) digits is 50625, while the sum is 41.

The spelling of 51510059591 in words is "fifty-one billion, five hundred ten million, fifty-nine thousand, five hundred ninety-one".