113445821 has 4 divisors (see below), whose sum is σ = 118378272. Its totient is φ = 108513372.

The previous prime is 113445809. The next prime is 113445841. The reversal of 113445821 is 128544311.

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 113445821 - 2⁶ = 113445757 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 (113445841) 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, 2466191 + ... + 2466236.

It is an arithmetic number, because the mean of its divisors is an integer number (29594568).

Almost surely, 2^113445821 is an apocalyptic number.

It is an amenable number.

113445821 is a deficient number, since it is larger than the sum of its proper divisors (4932451).

113445821 is an equidigital number, since it uses as much as digits as its factorization.

113445821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4932450.

The product of its digits is 3840, while the sum is 29.

The square root of 113445821 is about 10651.0948263547. The cubic root of 113445821 is about 484.0937780744.

The spelling of 113445821 in words is "one hundred thirteen million, four hundred forty-five thousand, eight hundred twenty-one".