113509621 has 8 divisors (see below), whose sum is σ = 115142040. Its totient is φ = 111885312.

The previous prime is 113509619. The next prime is 113509633. The reversal of 113509621 is 126905311.

It can be written as a sum of positive squares in 4 ways, for example, as 4536900 + 108972721 = 2130^2 + 10439^2 .

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 113509621 - 2¹ = 113509619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 113509621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113509601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29611 + ... + 33223.

It is an arithmetic number, because the mean of its divisors is an integer number (14392755).

Almost surely, 2^113509621 is an apocalyptic number.

It is an amenable number.

113509621 is a deficient number, since it is larger than the sum of its proper divisors (1632419).

113509621 is an equidigital number, since it uses as much as digits as its factorization.

113509621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4055.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 113509621 is about 10654.0894026660. The cubic root of 113509621 is about 484.1845097700.

The spelling of 113509621 in words is "one hundred thirteen million, five hundred nine thousand, six hundred twenty-one".