113563721 has 4 divisors (see below), whose sum is σ = 114605700. Its totient is φ = 112521744.

The previous prime is 113563717. The next prime is 113563729. The reversal of 113563721 is 127365311.

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 35046400 + 78517321 = 5920^2 + 8861^2 .

It is a cyclic number.

It is not a de Polignac number, because 113563721 - 2² = 113563717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113563729) 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, 520826 + ... + 521043.

It is an arithmetic number, because the mean of its divisors is an integer number (28651425).

Almost surely, 2^113563721 is an apocalyptic number.

It is an amenable number.

113563721 is a deficient number, since it is larger than the sum of its proper divisors (1041979).

113563721 is a wasteful number, since it uses less digits than its factorization.

113563721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041978.

The product of its digits is 3780, while the sum is 29.

The square root of 113563721 is about 10656.6280314178. The cubic root of 113563721 is about 484.2614202008.

The spelling of 113563721 in words is "one hundred thirteen million, five hundred sixty-three thousand, seven hundred twenty-one".