51394657 has 2 divisors, whose sum is σ = 51394658. Its totient is φ = 51394656.

The previous prime is 51394649. The next prime is 51394661. The reversal of 51394657 is 75649315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31404816 + 19989841 = 5604^2 + 4471^2 .

It is a cyclic number.

It is not a de Polignac number, because 51394657 - 2³ = 51394649 is a prime.

It is not a weakly prime, because it can be changed into another prime (51394697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25697328 + 25697329.

It is an arithmetic number, because the mean of its divisors is an integer number (25697329).

Almost surely, 2^51394657 is an apocalyptic number.

It is an amenable number.

51394657 is a deficient number, since it is larger than the sum of its proper divisors (1).

51394657 is an equidigital number, since it uses as much as digits as its factorization.

51394657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 40.

The square root of 51394657 is about 7169.0066954914. The cubic root of 51394657 is about 371.7970937430.

The spelling of 51394657 in words is "fifty-one million, three hundred ninety-four thousand, six hundred fifty-seven".