115116721 has 2 divisors, whose sum is σ = 115116722. Its totient is φ = 115116720.

The previous prime is 115116691. The next prime is 115116751. The reversal of 115116721 is 127611511.

It is a balanced prime because it is at equal distance from previous prime (115116691) and next prime (115116751).

It can be written as a sum of positive squares in only one way, i.e., 80730225 + 34386496 = 8985^2 + 5864^2 .

It is a cyclic number.

It is not a de Polignac number, because 115116721 - 2¹³ = 115108529 is a prime.

It is not a weakly prime, because it can be changed into another prime (115116751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57558360 + 57558361.

It is an arithmetic number, because the mean of its divisors is an integer number (57558361).

Almost surely, 2^115116721 is an apocalyptic number.

It is an amenable number.

115116721 is a deficient number, since it is larger than the sum of its proper divisors (1).

115116721 is an equidigital number, since it uses as much as digits as its factorization.

115116721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 25.

The square root of 115116721 is about 10729.2460592532. The cubic root of 115116721 is about 486.4588814503.

The spelling of 115116721 in words is "one hundred fifteen million, one hundred sixteen thousand, seven hundred twenty-one".