115197661 has 4 divisors (see below), whose sum is σ = 121974012. Its totient is φ = 108421312.

The previous prime is 115197637. The next prime is 115197679. The reversal of 115197661 is 166791511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166791511 = 2459 ⋅67829.

It can be written as a sum of positive squares in 2 ways, for example, as 106729561 + 8468100 = 10331^2 + 2910^2 .

It is a cyclic number.

It is not a de Polignac number, because 115197661 - 2¹³ = 115189469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 115197661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115197161) 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, 3388150 + ... + 3388183.

It is an arithmetic number, because the mean of its divisors is an integer number (30493503).

Almost surely, 2^115197661 is an apocalyptic number.

It is an amenable number.

115197661 is a deficient number, since it is larger than the sum of its proper divisors (6776351).

115197661 is an equidigital number, since it uses as much as digits as its factorization.

115197661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6776350.

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

The square root of 115197661 is about 10733.0173297167. The cubic root of 115197661 is about 486.5728665054.

The spelling of 115197661 in words is "one hundred fifteen million, one hundred ninety-seven thousand, six hundred sixty-one".