13641657 has 4 divisors (see below), whose sum is σ = 18188880. Its totient is φ = 9094436.

The previous prime is 13641637. The next prime is 13641671. The reversal of 13641657 is 75614631.

13641657 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13641657 - 2¹⁹ = 13117369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13641637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2273607 + ... + 2273612.

It is an arithmetic number, because the mean of its divisors is an integer number (4547220).

Almost surely, 2^13641657 is an apocalyptic number.

It is an amenable number.

13641657 is a deficient number, since it is larger than the sum of its proper divisors (4547223).

13641657 is an equidigital number, since it uses as much as digits as its factorization.

13641657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4547222.

The product of its digits is 15120, while the sum is 33.

The square root of 13641657 is about 3693.4613846634. The cubic root of 13641657 is about 238.9401004164.

The spelling of 13641657 in words is "thirteen million, six hundred forty-one thousand, six hundred fifty-seven".