11513155 has 4 divisors (see below), whose sum is σ = 13815792. Its totient is φ = 9210520.

The previous prime is 11513149. The next prime is 11513171. The reversal of 11513155 is 55131511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55131511 = 41 ⋅1344671.

It is a de Polignac number, because none of the positive numbers 2^k-11513155 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 1151311 + ... + 1151320.

It is an arithmetic number, because the mean of its divisors is an integer number (3453948).

Almost surely, 2^11513155 is an apocalyptic number.

11513155 is a deficient number, since it is larger than the sum of its proper divisors (2302637).

11513155 is an equidigital number, since it uses as much as digits as its factorization.

11513155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302636.

The product of its digits is 375, while the sum is 22.

The square root of 11513155 is about 3393.1040361298. The cubic root of 11513155 is about 225.8039061826.

Adding to 11513155 its reverse (55131511), we get a palindrome (66644666).

It can be divided in two parts, 1151315 and 5, that multiplied together give a palindrome (5756575).

The spelling of 11513155 in words is "eleven million, five hundred thirteen thousand, one hundred fifty-five".