13373561 has 4 divisors (see below), whose sum is σ = 13383012. Its totient is φ = 13364112.

The previous prime is 13373519. The next prime is 13373567. The reversal of 13373561 is 16537331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16537331 = 907 ⋅18233.

It can be written as a sum of positive squares in 2 ways, for example, as 6250000 + 7123561 = 2500^2 + 2669^2 .

It is a cyclic number.

It is not a de Polignac number, because 13373561 - 2⁶ = 13373497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13373567) 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, 2126 + ... + 5591.

It is an arithmetic number, because the mean of its divisors is an integer number (3345753).

Almost surely, 2^13373561 is an apocalyptic number.

It is an amenable number.

13373561 is a deficient number, since it is larger than the sum of its proper divisors (9451).

13373561 is an equidigital number, since it uses as much as digits as its factorization.

13373561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9450.

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

The square root of 13373561 is about 3656.9879682602. The cubic root of 13373561 is about 237.3644567310.

The spelling of 13373561 in words is "thirteen million, three hundred seventy-three thousand, five hundred sixty-one".