11558161 has 4 divisors (see below), whose sum is σ = 11721024. Its totient is φ = 11395300.

The previous prime is 11558149. The next prime is 11558177. The reversal of 11558161 is 16185511.

11558161 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11558161 - 2¹¹ = 11556113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11558101) 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, 81325 + ... + 81466.

It is an arithmetic number, because the mean of its divisors is an integer number (2930256).

Almost surely, 2^11558161 is an apocalyptic number.

It is an amenable number.

11558161 is a deficient number, since it is larger than the sum of its proper divisors (162863).

11558161 is an equidigital number, since it uses as much as digits as its factorization.

11558161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162862.

The product of its digits is 1200, while the sum is 28.

The square root of 11558161 is about 3399.7295480670. The cubic root of 11558161 is about 226.0977531542.

It can be divided in two parts, 1155 and 8161, that added together give a triangular number (9316 = T₁₃₆).

The spelling of 11558161 in words is "eleven million, five hundred fifty-eight thousand, one hundred sixty-one".