115964561 has 2 divisors, whose sum is σ = 115964562. Its totient is φ = 115964560.

The previous prime is 115964491. The next prime is 115964579. The reversal of 115964561 is 165469511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80442961 + 35521600 = 8969^2 + 5960^2 .

It is an emirp because it is prime and its reverse (165469511) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115964561 is a prime.

It is not a weakly prime, because it can be changed into another prime (115964161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57982280 + 57982281.

It is an arithmetic number, because the mean of its divisors is an integer number (57982281).

Almost surely, 2^115964561 is an apocalyptic number.

It is an amenable number.

115964561 is a deficient number, since it is larger than the sum of its proper divisors (1).

115964561 is an equidigital number, since it uses as much as digits as its factorization.

115964561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 38.

The square root of 115964561 is about 10768.6842743206. The cubic root of 115964561 is about 487.6502255412.

The spelling of 115964561 in words is "one hundred fifteen million, nine hundred sixty-four thousand, five hundred sixty-one".