113187181 has 4 divisors (see below), whose sum is σ = 116246332. Its totient is φ = 110128032.

The previous prime is 113187167. The next prime is 113187197. The reversal of 113187181 is 181781311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 94264681 + 18922500 = 9709^2 + 4350^2 .

It is a cyclic number.

It is not a de Polignac number, because 113187181 - 2¹⁵ = 113154413 is a prime.

It is a super-2 number, since 2×113187181² = 25622675885453522, 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 (113187121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1529520 + ... + 1529593.

It is an arithmetic number, because the mean of its divisors is an integer number (29061583).

Almost surely, 2^113187181 is an apocalyptic number.

It is an amenable number.

113187181 is a deficient number, since it is larger than the sum of its proper divisors (3059151).

113187181 is an equidigital number, since it uses as much as digits as its factorization.

113187181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3059150.

The product of its digits is 1344, while the sum is 31.

The square root of 113187181 is about 10638.9464234011. The cubic root of 113187181 is about 483.7256103010.

The spelling of 113187181 in words is "one hundred thirteen million, one hundred eighty-seven thousand, one hundred eighty-one".