51625891 has 4 divisors (see below), whose sum is σ = 51742872. Its totient is φ = 51508912.

The previous prime is 51625883. The next prime is 51625913. The reversal of 51625891 is 19852615.

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 51625891 - 2³ = 51625883 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51625891.

It is not an unprimeable number, because it can be changed into a prime (51625391) 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, 57826 + ... + 58711.

It is an arithmetic number, because the mean of its divisors is an integer number (12935718).

Almost surely, 2^51625891 is an apocalyptic number.

51625891 is a deficient number, since it is larger than the sum of its proper divisors (116981).

51625891 is a wasteful number, since it uses less digits than its factorization.

51625891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116980.

The product of its digits is 21600, while the sum is 37.

The square root of 51625891 is about 7185.1159350424. The cubic root of 51625891 is about 372.3538540542.

The spelling of 51625891 in words is "fifty-one million, six hundred twenty-five thousand, eight hundred ninety-one".