116399561 has 4 divisors (see below), whose sum is σ = 123246612. Its totient is φ = 109552512.

The previous prime is 116399557. The next prime is 116399587. The reversal of 116399561 is 165993611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165993611 = 7 ⋅23713373.

It can be written as a sum of positive squares in 2 ways, for example, as 104427961 + 11971600 = 10219^2 + 3460^2 .

It is a cyclic number.

It is not a de Polignac number, because 116399561 - 2² = 116399557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (116399551) 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, 3423500 + ... + 3423533.

It is an arithmetic number, because the mean of its divisors is an integer number (30811653).

Almost surely, 2^116399561 is an apocalyptic number.

It is an amenable number.

116399561 is a deficient number, since it is larger than the sum of its proper divisors (6847051).

116399561 is an equidigital number, since it uses as much as digits as its factorization.

116399561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6847050.

The product of its digits is 43740, while the sum is 41.

The square root of 116399561 is about 10788.8628223738. The cubic root of 116399561 is about 488.2592137724.

The spelling of 116399561 in words is "one hundred sixteen million, three hundred ninety-nine thousand, five hundred sixty-one".