51904417 has 4 divisors (see below), whose sum is σ = 54957636. Its totient is φ = 48851200.

The previous prime is 51904379. The next prime is 51904421. The reversal of 51904417 is 71440915.

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

It can be written as a sum of positive squares in 2 ways, for example, as 32535616 + 19368801 = 5704^2 + 4401^2 .

It is not a de Polignac number, because 51904417 - 2⁷ = 51904289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51904487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1526584 + ... + 1526617.

It is an arithmetic number, because the mean of its divisors is an integer number (13739409).

Almost surely, 2^51904417 is an apocalyptic number.

It is an amenable number.

51904417 is a deficient number, since it is larger than the sum of its proper divisors (3053219).

51904417 is a wasteful number, since it uses less digits than its factorization.

51904417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3053218.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 51904417 is about 7204.4720139647. The cubic root of 51904417 is about 373.0222801489.

The spelling of 51904417 in words is "fifty-one million, nine hundred four thousand, four hundred seventeen".