115247221 has 2 divisors, whose sum is σ = 115247222. Its totient is φ = 115247220.

The previous prime is 115247203. The next prime is 115247261. The reversal of 115247221 is 122742511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97732996 + 17514225 = 9886^2 + 4185^2 .

It is a cyclic number.

It is not a de Polignac number, because 115247221 - 2⁹ = 115246709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115247261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57623610 + 57623611.

It is an arithmetic number, because the mean of its divisors is an integer number (57623611).

Almost surely, 2^115247221 is an apocalyptic number.

It is an amenable number.

115247221 is a deficient number, since it is larger than the sum of its proper divisors (1).

115247221 is an equidigital number, since it uses as much as digits as its factorization.

115247221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1120, while the sum is 25.

The square root of 115247221 is about 10735.3258450780. The cubic root of 115247221 is about 486.6426338187.

Adding to 115247221 its reverse (122742511), we get a palindrome (237989732).

The spelling of 115247221 in words is "one hundred fifteen million, two hundred forty-seven thousand, two hundred twenty-one".