113981221 has 2 divisors, whose sum is σ = 113981222. Its totient is φ = 113981220.

The previous prime is 113981213. The next prime is 113981233. The reversal of 113981221 is 122189311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101808100 + 12173121 = 10090^2 + 3489^2 .

It is an emirp because it is prime and its reverse (122189311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 113981221 - 2³ = 113981213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 113981221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (113987221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56990610 + 56990611.

It is an arithmetic number, because the mean of its divisors is an integer number (56990611).

Almost surely, 2^113981221 is an apocalyptic number.

It is an amenable number.

113981221 is a deficient number, since it is larger than the sum of its proper divisors (1).

113981221 is an equidigital number, since it uses as much as digits as its factorization.

113981221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 28.

The square root of 113981221 is about 10676.1988085648. The cubic root of 113981221 is about 484.8541326314.

The spelling of 113981221 in words is "one hundred thirteen million, nine hundred eighty-one thousand, two hundred twenty-one".