13564493 has 4 divisors (see below), whose sum is σ = 13590108. Its totient is φ = 13538880.

The previous prime is 13564483. The next prime is 13564517. The reversal of 13564493 is 39446531.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5396329 + 8168164 = 2323^2 + 2858^2 .

It is a cyclic number.

It is not a de Polignac number, because 13564493 - 2⁶ = 13564429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13564433) 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, 11996 + ... + 13077.

It is an arithmetic number, because the mean of its divisors is an integer number (3397527).

Almost surely, 2^13564493 is an apocalyptic number.

It is an amenable number.

13564493 is a deficient number, since it is larger than the sum of its proper divisors (25615).

13564493 is an equidigital number, since it uses as much as digits as its factorization.

13564493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25614.

The product of its digits is 38880, while the sum is 35.

The square root of 13564493 is about 3683.0005430355. Note that the first 3 decimals coincide. The cubic root of 13564493 is about 238.4887269114.

The spelling of 13564493 in words is "thirteen million, five hundred sixty-four thousand, four hundred ninety-three".