113661221 has 8 divisors (see below), whose sum is σ = 118470144. Its totient is φ = 108923760.

The previous prime is 113661217. The next prime is 113661257. The reversal of 113661221 is 122166311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 113661221 - 2² = 113661217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113661281) 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 7 ways as a sum of consecutive naturals, for example, 14606 + ... + 20991.

It is an arithmetic number, because the mean of its divisors is an integer number (14808768).

Almost surely, 2^113661221 is an apocalyptic number.

It is an amenable number.

113661221 is a deficient number, since it is larger than the sum of its proper divisors (4808923).

113661221 is a wasteful number, since it uses less digits than its factorization.

113661221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35731.

The product of its digits is 432, while the sum is 23.

The square root of 113661221 is about 10661.2016677296. The cubic root of 113661221 is about 484.3999679173.

The spelling of 113661221 in words is "one hundred thirteen million, six hundred sixty-one thousand, two hundred twenty-one".