13555657 has 2 divisors, whose sum is σ = 13555658. Its totient is φ = 13555656.

The previous prime is 13555639. The next prime is 13555669. The reversal of 13555657 is 75655531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8667136 + 4888521 = 2944^2 + 2211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13555657 is a prime.

It is not a weakly prime, because it can be changed into another prime (13555957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6777828 + 6777829.

It is an arithmetic number, because the mean of its divisors is an integer number (6777829).

Almost surely, 2^13555657 is an apocalyptic number.

It is an amenable number.

13555657 is a deficient number, since it is larger than the sum of its proper divisors (1).

13555657 is an equidigital number, since it uses as much as digits as its factorization.

13555657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78750, while the sum is 37.

The square root of 13555657 is about 3681.8007822260. The cubic root of 13555657 is about 238.4369312878.

The spelling of 13555657 in words is "thirteen million, five hundred fifty-five thousand, six hundred fifty-seven".