115896661 has 4 divisors (see below), whose sum is σ = 116105292. Its totient is φ = 115688032.

The previous prime is 115896643. The next prime is 115896721. The reversal of 115896661 is 166698511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166698511 = 7 ⋅23814073.

It can be written as a sum of positive squares in 2 ways, for example, as 3218436 + 112678225 = 1794^2 + 10615^2 .

It is a cyclic number.

It is not a de Polignac number, because 115896661 - 2¹¹ = 115894613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115896061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103480 + ... + 104593.

It is an arithmetic number, because the mean of its divisors is an integer number (29026323).

Almost surely, 2^115896661 is an apocalyptic number.

It is an amenable number.

115896661 is a deficient number, since it is larger than the sum of its proper divisors (208631).

115896661 is an equidigital number, since it uses as much as digits as its factorization.

115896661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208630.

The product of its digits is 77760, while the sum is 43.

The square root of 115896661 is about 10765.5311527114. The cubic root of 115896661 is about 487.5550300359. Note that the first 3 decimals are identical.

The spelling of 115896661 in words is "one hundred fifteen million, eight hundred ninety-six thousand, six hundred sixty-one".