51608813 has 2 divisors, whose sum is σ = 51608814. Its totient is φ = 51608812.

The previous prime is 51608797. The next prime is 51608839. The reversal of 51608813 is 31880615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30614089 + 20994724 = 5533^2 + 4582^2 .

It is a cyclic number.

It is not a de Polignac number, because 51608813 - 2⁴ = 51608797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51608813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51607813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25804406 + 25804407.

It is an arithmetic number, because the mean of its divisors is an integer number (25804407).

Almost surely, 2^51608813 is an apocalyptic number.

It is an amenable number.

51608813 is a deficient number, since it is larger than the sum of its proper divisors (1).

51608813 is an equidigital number, since it uses as much as digits as its factorization.

51608813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 51608813 is about 7183.9274077624. The cubic root of 51608813 is about 372.3127909344.

The spelling of 51608813 in words is "fifty-one million, six hundred eight thousand, eight hundred thirteen".