51900251 has 4 divisors (see below), whose sum is σ = 55892592. Its totient is φ = 47907912.

The previous prime is 51900223. The next prime is 51900253. The reversal of 51900251 is 15200915.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51900251 - 2¹⁸ = 51638107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51900253) 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, 1996151 + ... + 1996176.

It is an arithmetic number, because the mean of its divisors is an integer number (13973148).

Almost surely, 2^51900251 is an apocalyptic number.

51900251 is a deficient number, since it is larger than the sum of its proper divisors (3992341).

51900251 is a wasteful number, since it uses less digits than its factorization.

51900251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3992340.

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 51900251 is about 7204.1828821873. The cubic root of 51900251 is about 373.0122999296.

The spelling of 51900251 in words is "fifty-one million, nine hundred thousand, two hundred fifty-one".