113538221 has 2 divisors, whose sum is σ = 113538222. Its totient is φ = 113538220.

The previous prime is 113538203. The next prime is 113538253. The reversal of 113538221 is 122835311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57078025 + 56460196 = 7555^2 + 7514^2 .

It is an emirp because it is prime and its reverse (122835311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 113538221 - 2⁶ = 113538157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113508221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56769110 + 56769111.

It is an arithmetic number, because the mean of its divisors is an integer number (56769111).

Almost surely, 2^113538221 is an apocalyptic number.

It is an amenable number.

113538221 is a deficient number, since it is larger than the sum of its proper divisors (1).

113538221 is an equidigital number, since it uses as much as digits as its factorization.

113538221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 26.

The square root of 113538221 is about 10655.4315257525. The cubic root of 113538221 is about 484.2251715629.

The spelling of 113538221 in words is "one hundred thirteen million, five hundred thirty-eight thousand, two hundred twenty-one".