51256417 has 2 divisors, whose sum is σ = 51256418. Its totient is φ = 51256416.

The previous prime is 51256399. The next prime is 51256421. The reversal of 51256417 is 71465215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28987456 + 22268961 = 5384^2 + 4719^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51256417 is a prime.

It is not a weakly prime, because it can be changed into another prime (51256477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25628208 + 25628209.

It is an arithmetic number, because the mean of its divisors is an integer number (25628209).

Almost surely, 2^51256417 is an apocalyptic number.

It is an amenable number.

51256417 is a deficient number, since it is larger than the sum of its proper divisors (1).

51256417 is an equidigital number, since it uses as much as digits as its factorization.

51256417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8400, while the sum is 31.

The square root of 51256417 is about 7159.3587003306. The cubic root of 51256417 is about 371.4634443941.

The spelling of 51256417 in words is "fifty-one million, two hundred fifty-six thousand, four hundred seventeen".