113641661 has 4 divisors (see below), whose sum is σ = 129876192. Its totient is φ = 97407132.

The previous prime is 113641657. The next prime is 113641669. The reversal of 113641661 is 166146311.

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 113641661 - 2² = 113641657 is a prime.

It is a super-2 number, since 2×113641661² = 25828854229677842, 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 (113641669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8117255 + ... + 8117268.

It is an arithmetic number, because the mean of its divisors is an integer number (32469048).

Almost surely, 2^113641661 is an apocalyptic number.

It is an amenable number.

113641661 is a deficient number, since it is larger than the sum of its proper divisors (16234531).

113641661 is an equidigital number, since it uses as much as digits as its factorization.

113641661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16234530.

The product of its digits is 2592, while the sum is 29.

The square root of 113641661 is about 10660.2842832637. The cubic root of 113641661 is about 484.3721794688.

Adding to 113641661 its reverse (166146311), we get a palindrome (279787972).

The spelling of 113641661 in words is "one hundred thirteen million, six hundred forty-one thousand, six hundred sixty-one".