113566721 has 2 divisors, whose sum is σ = 113566722. Its totient is φ = 113566720.

The previous prime is 113566703. The next prime is 113566751. The reversal of 113566721 is 127665311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113124496 + 442225 = 10636^2 + 665^2 .

It is an emirp because it is prime and its reverse (127665311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 113566721 - 2¹⁸ = 113304577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (113566751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56783360 + 56783361.

It is an arithmetic number, because the mean of its divisors is an integer number (56783361).

Almost surely, 2^113566721 is an apocalyptic number.

It is an amenable number.

113566721 is a deficient number, since it is larger than the sum of its proper divisors (1).

113566721 is an equidigital number, since it uses as much as digits as its factorization.

113566721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 32.

The square root of 113566721 is about 10656.7687879582. The cubic root of 113566721 is about 484.2656843897.

The spelling of 113566721 in words is "one hundred thirteen million, five hundred sixty-six thousand, seven hundred twenty-one".