51256637 has 2 divisors, whose sum is σ = 51256638. Its totient is φ = 51256636.

The previous prime is 51256589. The next prime is 51256651. The reversal of 51256637 is 73665215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47623801 + 3632836 = 6901^2 + 1906^2 .

It is a cyclic number.

It is not a de Polignac number, because 51256637 - 2¹⁴ = 51240253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51256597 and 51256606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51256697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25628318 + 25628319.

It is an arithmetic number, because the mean of its divisors is an integer number (25628319).

Almost surely, 2^51256637 is an apocalyptic number.

It is an amenable number.

51256637 is a deficient number, since it is larger than the sum of its proper divisors (1).

51256637 is an equidigital number, since it uses as much as digits as its factorization.

51256637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 35.

The square root of 51256637 is about 7159.3740648188. The cubic root of 51256637 is about 371.4639758517.

The spelling of 51256637 in words is "fifty-one million, two hundred fifty-six thousand, six hundred thirty-seven".