115719661 has 2 divisors, whose sum is σ = 115719662. Its totient is φ = 115719660.

The previous prime is 115719649. The next prime is 115719689. The reversal of 115719661 is 166917511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84750436 + 30969225 = 9206^2 + 5565^2 .

It is a cyclic number.

It is not a de Polignac number, because 115719661 - 2¹⁷ = 115588589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 115719661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115719641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57859830 + 57859831.

It is an arithmetic number, because the mean of its divisors is an integer number (57859831).

Almost surely, 2^115719661 is an apocalyptic number.

It is an amenable number.

115719661 is a deficient number, since it is larger than the sum of its proper divisors (1).

115719661 is an equidigital number, since it uses as much as digits as its factorization.

115719661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 37.

The square root of 115719661 is about 10757.3073303685. The cubic root of 115719661 is about 487.3067018886.

The spelling of 115719661 in words is "one hundred fifteen million, seven hundred nineteen thousand, six hundred sixty-one".