115667221 has 2 divisors, whose sum is σ = 115667222. Its totient is φ = 115667220.

The previous prime is 115667173. The next prime is 115667239. The reversal of 115667221 is 122766511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112656996 + 3010225 = 10614^2 + 1735^2 .

It is a cyclic number.

It is not a de Polignac number, because 115667221 - 2⁷ = 115667093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115667261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57833610 + 57833611.

It is an arithmetic number, because the mean of its divisors is an integer number (57833611).

Almost surely, 2^115667221 is an apocalyptic number.

It is an amenable number.

115667221 is a deficient number, since it is larger than the sum of its proper divisors (1).

115667221 is an equidigital number, since it uses as much as digits as its factorization.

115667221 is an evil number, because the sum of its binary digits is even.

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

The square root of 115667221 is about 10754.8696412369. The cubic root of 115667221 is about 487.2330807934.

The spelling of 115667221 in words is "one hundred fifteen million, six hundred sixty-seven thousand, two hundred twenty-one".