51632591 has 4 divisors (see below), whose sum is σ = 51667392. Its totient is φ = 51597792.

The previous prime is 51632579. The next prime is 51632593. The reversal of 51632591 is 19523615.

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 51632591 - 2⁶ = 51632527 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 (51632593) 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, 15071 + ... + 18176.

It is an arithmetic number, because the mean of its divisors is an integer number (12916848).

Almost surely, 2^51632591 is an apocalyptic number.

51632591 is a deficient number, since it is larger than the sum of its proper divisors (34801).

51632591 is a wasteful number, since it uses less digits than its factorization.

51632591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34800.

The product of its digits is 8100, while the sum is 32.

The square root of 51632591 is about 7185.5821615232. The cubic root of 51632591 is about 372.3699613656.

The spelling of 51632591 in words is "fifty-one million, six hundred thirty-two thousand, five hundred ninety-one".