51657013 has 2 divisors, whose sum is σ = 51657014. Its totient is φ = 51657012.

The previous prime is 51656993. The next prime is 51657019. The reversal of 51657013 is 31075615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35319249 + 16337764 = 5943^2 + 4042^2 .

It is a cyclic number.

It is not a de Polignac number, because 51657013 - 2⁵ = 51656981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51657019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25828506 + 25828507.

It is an arithmetic number, because the mean of its divisors is an integer number (25828507).

Almost surely, 2^51657013 is an apocalyptic number.

It is an amenable number.

51657013 is a deficient number, since it is larger than the sum of its proper divisors (1).

51657013 is an equidigital number, since it uses as much as digits as its factorization.

51657013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3150, while the sum is 28.

The square root of 51657013 is about 7187.2813358042. The cubic root of 51657013 is about 372.4286619240.

The spelling of 51657013 in words is "fifty-one million, six hundred fifty-seven thousand, thirteen".