113561191 has 4 divisors (see below), whose sum is σ = 113620000. Its totient is φ = 113502384.

The previous prime is 113561183. The next prime is 113561197. The reversal of 113561191 is 191165311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191165311 = 839 ⋅227849.

It is a cyclic number.

It is not a de Polignac number, because 113561191 - 2³ = 113561183 is a prime.

It is a super-2 number, since 2×113561191² = 25792288202676962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113561197) 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, 26406 + ... + 30403.

It is an arithmetic number, because the mean of its divisors is an integer number (28405000).

Almost surely, 2^113561191 is an apocalyptic number.

113561191 is a deficient number, since it is larger than the sum of its proper divisors (58809).

113561191 is an equidigital number, since it uses as much as digits as its factorization.

113561191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58808.

The product of its digits is 810, while the sum is 28.

The square root of 113561191 is about 10656.5093252903. The cubic root of 113561191 is about 484.2578240098.

It can be divided in two parts, 1135 and 61191, that added together give a palindrome (62326).

The spelling of 113561191 in words is "one hundred thirteen million, five hundred sixty-one thousand, one hundred ninety-one".