13555557 has 24 divisors (see below), whose sum is σ = 20442240. Its totient is φ = 8645280.

The previous prime is 13555547. The next prime is 13555561. The reversal of 13555557 is 75555531.

13555557 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13555557 - 2⁴ = 13555541 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13555547) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43432 + ... + 43742.

It is an arithmetic number, because the mean of its divisors is an integer number (851760).

Almost surely, 2^13555557 is an apocalyptic number.

It is an amenable number.

13555557 is a deficient number, since it is larger than the sum of its proper divisors (6886683).

13555557 is a wasteful number, since it uses less digits than its factorization.

13555557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513 (or 510 counting only the distinct ones).

The product of its digits is 65625, while the sum is 36.

The square root of 13555557 is about 3681.7872018899. The cubic root of 13555557 is about 238.4363449704.

The spelling of 13555557 in words is "thirteen million, five hundred fifty-five thousand, five hundred fifty-seven".