51204491 has 8 divisors (see below), whose sum is σ = 55423200. Its totient is φ = 47025792.

The previous prime is 51204427. The next prime is 51204497. The reversal of 51204491 is 19440215.

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 51204491 - 2⁶ = 51204427 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 51204491.

It is not an unprimeable number, because it can be changed into a prime (51204497) 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, 7310 + ... + 12483.

It is an arithmetic number, because the mean of its divisors is an integer number (6927900).

Almost surely, 2^51204491 is an apocalyptic number.

51204491 is a deficient number, since it is larger than the sum of its proper divisors (4218709).

51204491 is a wasteful number, since it uses less digits than its factorization.

51204491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20005.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 51204491 is about 7155.7313392832. The cubic root of 51204491 is about 371.3379633380.

The spelling of 51204491 in words is "fifty-one million, two hundred four thousand, four hundred ninety-one".