13155813 has 12 divisors (see below), whose sum is σ = 20730528. Its totient is φ = 7973160.

The previous prime is 13155781. The next prime is 13155827. The reversal of 13155813 is 31855131.

It is not a de Polignac number, because 13155813 - 2⁵ = 13155781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13155853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66345 + ... + 66542.

It is an arithmetic number, because the mean of its divisors is an integer number (1727544).

Almost surely, 2^13155813 is an apocalyptic number.

It is an amenable number.

13155813 is a deficient number, since it is larger than the sum of its proper divisors (7574715).

13155813 is a wasteful number, since it uses less digits than its factorization.

13155813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132904 (or 132901 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 13155813 is about 3627.0942915783. The cubic root of 13155813 is about 236.0691468838.

The spelling of 13155813 in words is "thirteen million, one hundred fifty-five thousand, eight hundred thirteen".