51986591 has 8 divisors (see below), whose sum is σ = 53994960. Its totient is φ = 50010048.

The previous prime is 51986581. The next prime is 51986609. The reversal of 51986591 is 19568915.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51986591 - 2¹⁰ = 51985567 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 (51986521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4601 + ... + 11186.

It is an arithmetic number, because the mean of its divisors is an integer number (6749370).

Almost surely, 2^51986591 is an apocalyptic number.

51986591 is a deficient number, since it is larger than the sum of its proper divisors (2008369).

51986591 is a wasteful number, since it uses less digits than its factorization.

51986591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15913.

The product of its digits is 97200, while the sum is 44.

The square root of 51986591 is about 7210.1727441165. The cubic root of 51986591 is about 373.2190300761.

The spelling of 51986591 in words is "fifty-one million, nine hundred eighty-six thousand, five hundred ninety-one".