13613573 has 4 divisors (see below), whose sum is σ = 13643820. Its totient is φ = 13583328.

The previous prime is 13613569. The next prime is 13613581. The reversal of 13613573 is 37531631.

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 5536609 + 8076964 = 2353^2 + 2842^2 .

It is a cyclic number.

It is not a de Polignac number, because 13613573 - 2² = 13613569 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13613513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14438 + ... + 15351.

It is an arithmetic number, because the mean of its divisors is an integer number (3410955).

Almost surely, 2^13613573 is an apocalyptic number.

It is an amenable number.

13613573 is a deficient number, since it is larger than the sum of its proper divisors (30247).

13613573 is an equidigital number, since it uses as much as digits as its factorization.

13613573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30246.

The product of its digits is 5670, while the sum is 29.

The square root of 13613573 is about 3689.6575721874. The cubic root of 13613573 is about 238.7760195686.

The spelling of 13613573 in words is "thirteen million, six hundred thirteen thousand, five hundred seventy-three".