51787657 has 2 divisors, whose sum is σ = 51787658. Its totient is φ = 51787656.

The previous prime is 51787607. The next prime is 51787669. The reversal of 51787657 is 75678715.

51787657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51494976 + 292681 = 7176^2 + 541^2 .

It is a cyclic number.

It is not a de Polignac number, because 51787657 - 2⁷ = 51787529 is a prime.

It is a super-2 number, since 2×51787657² = 5363922835099298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51787607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25893828 + 25893829.

It is an arithmetic number, because the mean of its divisors is an integer number (25893829).

Almost surely, 2^51787657 is an apocalyptic number.

It is an amenable number.

51787657 is a deficient number, since it is larger than the sum of its proper divisors (1).

51787657 is an equidigital number, since it uses as much as digits as its factorization.

51787657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 411600, while the sum is 46.

The square root of 51787657 is about 7196.3641514309. The cubic root of 51787657 is about 372.7423631822.

The spelling of 51787657 in words is "fifty-one million, seven hundred eighty-seven thousand, six hundred fifty-seven".