13115555 has 4 divisors (see below), whose sum is σ = 15738672. Its totient is φ = 10492440.

The previous prime is 13115537. The next prime is 13115563. The reversal of 13115555 is 55551131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55551131 = 311 ⋅178621.

It is not a de Polignac number, because 13115555 - 2²⁰ = 12066979 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1311551 + ... + 1311560.

It is an arithmetic number, because the mean of its divisors is an integer number (3934668).

Almost surely, 2^13115555 is an apocalyptic number.

13115555 is a deficient number, since it is larger than the sum of its proper divisors (2623117).

13115555 is an equidigital number, since it uses as much as digits as its factorization.

13115555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2623116.

The product of its digits is 1875, while the sum is 26.

The square root of 13115555 is about 3621.5404181094. The cubic root of 13115555 is about 235.8281030637.

Adding to 13115555 its reverse (55551131), we get a palindrome (68666686).

The spelling of 13115555 in words is "thirteen million, one hundred fifteen thousand, five hundred fifty-five".