13564813 has 2 divisors, whose sum is σ = 13564814. Its totient is φ = 13564812.

The previous prime is 13564807. The next prime is 13564843. The reversal of 13564813 is 31846531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13564489 + 324 = 3683^2 + 18^2 .

It is a cyclic number.

It is not a de Polignac number, because 13564813 - 2⁹ = 13564301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13564843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6782406 + 6782407.

It is an arithmetic number, because the mean of its divisors is an integer number (6782407).

Almost surely, 2^13564813 is an apocalyptic number.

It is an amenable number.

13564813 is a deficient number, since it is larger than the sum of its proper divisors (1).

13564813 is an equidigital number, since it uses as much as digits as its factorization.

13564813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 13564813 is about 3683.0439856184. The cubic root of 13564813 is about 238.4906022928.

The spelling of 13564813 in words is "thirteen million, five hundred sixty-four thousand, eight hundred thirteen".