51568697 has 2 divisors, whose sum is σ = 51568698. Its totient is φ = 51568696.

The previous prime is 51568669. The next prime is 51568721. The reversal of 51568697 is 79686515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51566761 + 1936 = 7181^2 + 44^2 .

It is a cyclic number.

It is not a de Polignac number, because 51568697 - 2¹⁶ = 51503161 is a prime.

It is not a weakly prime, because it can be changed into another prime (51568637) 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, 25784348 + 25784349.

It is an arithmetic number, because the mean of its divisors is an integer number (25784349).

Almost surely, 2^51568697 is an apocalyptic number.

It is an amenable number.

51568697 is a deficient number, since it is larger than the sum of its proper divisors (1).

51568697 is an equidigital number, since it uses as much as digits as its factorization.

51568697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 453600, while the sum is 47.

The square root of 51568697 is about 7181.1347989019. The cubic root of 51568697 is about 372.2162985551.

The spelling of 51568697 in words is "fifty-one million, five hundred sixty-eight thousand, six hundred ninety-seven".