51257917 has 2 divisors, whose sum is σ = 51257918. Its totient is φ = 51257916.

The previous prime is 51257909. The next prime is 51257929. The reversal of 51257917 is 71975215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41654116 + 9603801 = 6454^2 + 3099^2 .

It is a cyclic number.

It is not a de Polignac number, because 51257917 - 2³ = 51257909 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51257977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25628958 + 25628959.

It is an arithmetic number, because the mean of its divisors is an integer number (25628959).

Almost surely, 2^51257917 is an apocalyptic number.

It is an amenable number.

51257917 is a deficient number, since it is larger than the sum of its proper divisors (1).

51257917 is an equidigital number, since it uses as much as digits as its factorization.

51257917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22050, while the sum is 37.

The square root of 51257917 is about 7159.4634575504. The cubic root of 51257917 is about 371.4670679386.

The spelling of 51257917 in words is "fifty-one million, two hundred fifty-seven thousand, nine hundred seventeen".