51551657 has 2 divisors, whose sum is σ = 51551658. Its totient is φ = 51551656.

The previous prime is 51551653. The next prime is 51551683. The reversal of 51551657 is 75615515.

51551657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34445161 + 17106496 = 5869^2 + 4136^2 .

It is a cyclic number.

It is not a de Polignac number, because 51551657 - 2² = 51551653 is a prime.

It is not a weakly prime, because it can be changed into another prime (51551653) 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, 25775828 + 25775829.

It is an arithmetic number, because the mean of its divisors is an integer number (25775829).

Almost surely, 2^51551657 is an apocalyptic number.

It is an amenable number.

51551657 is a deficient number, since it is larger than the sum of its proper divisors (1).

51551657 is an equidigital number, since it uses as much as digits as its factorization.

51551657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26250, while the sum is 35.

The square root of 51551657 is about 7179.9482588665. The cubic root of 51551657 is about 372.1752965208.

The spelling of 51551657 in words is "fifty-one million, five hundred fifty-one thousand, six hundred fifty-seven".