51136591 has 8 divisors (see below), whose sum is σ = 55853568. Its totient is φ = 46431000.

The previous prime is 51136537. The next prime is 51136607. The reversal of 51136591 is 19563115.

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

It is not a de Polignac number, because 51136591 - 2²³ = 42747983 is a prime.

It is a super-2 number, since 2×51136591² = 5229901878202562, which 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 (51136511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8556 + ... + 13246.

It is an arithmetic number, because the mean of its divisors is an integer number (6981696).

Almost surely, 2^51136591 is an apocalyptic number.

51136591 is a deficient number, since it is larger than the sum of its proper divisors (4716977).

51136591 is a wasteful number, since it uses less digits than its factorization.

51136591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5693.

The product of its digits is 4050, while the sum is 31.

The square root of 51136591 is about 7150.9853167238. The cubic root of 51136591 is about 371.1737524753.

The spelling of 51136591 in words is "fifty-one million, one hundred thirty-six thousand, five hundred ninety-one".