116516561 has 6 divisors (see below), whose sum is σ = 135539730. Its totient is φ = 99871296.

The previous prime is 116516557. The next prime is 116516579. The reversal of 116516561 is 165615611.

It can be written as a sum of positive squares in only one way, i.e., 107329600 + 9186961 = 10360^2 + 3031^2 .

It is not a de Polignac number, because 116516561 - 2² = 116516557 is a prime.

It is a super-3 number, since 3×116516561³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (116516501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1188896 + ... + 1188993.

It is an arithmetic number, because the mean of its divisors is an integer number (22589955).

Almost surely, 2^116516561 is an apocalyptic number.

It is an amenable number.

116516561 is a deficient number, since it is larger than the sum of its proper divisors (19023169).

116516561 is an equidigital number, since it uses as much as digits as its factorization.

116516561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377903 (or 2377896 counting only the distinct ones).

The product of its digits is 5400, while the sum is 32.

The square root of 116516561 is about 10794.2837187096. The cubic root of 116516561 is about 488.4227516124.

The spelling of 116516561 in words is "one hundred sixteen million, five hundred sixteen thousand, five hundred sixty-one".