113538721 has 4 divisors (see below), whose sum is σ = 114976000. Its totient is φ = 112101444.

The previous prime is 113538701. The next prime is 113538769. The reversal of 113538721 is 127835311.

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 113538721 - 2¹⁷ = 113407649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (113538701) 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, 718521 + ... + 718678.

It is an arithmetic number, because the mean of its divisors is an integer number (28744000).

Almost surely, 2^113538721 is an apocalyptic number.

It is an amenable number.

113538721 is a deficient number, since it is larger than the sum of its proper divisors (1437279).

113538721 is an equidigital number, since it uses as much as digits as its factorization.

113538721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437278.

The product of its digits is 5040, while the sum is 31.

The square root of 113538721 is about 10655.4549879393. The cubic root of 113538721 is about 484.2258823727.

The spelling of 113538721 in words is "one hundred thirteen million, five hundred thirty-eight thousand, seven hundred twenty-one".