116831861 has 2 divisors, whose sum is σ = 116831862. Its totient is φ = 116831860.

The previous prime is 116831857. The next prime is 116831867. The reversal of 116831861 is 168138611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94458961 + 22372900 = 9719^2 + 4730^2 .

It is an emirp because it is prime and its reverse (168138611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 116831861 - 2² = 116831857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (116831867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58415930 + 58415931.

It is an arithmetic number, because the mean of its divisors is an integer number (58415931).

Almost surely, 2^116831861 is an apocalyptic number.

It is an amenable number.

116831861 is a deficient number, since it is larger than the sum of its proper divisors (1).

116831861 is an equidigital number, since it uses as much as digits as its factorization.

116831861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 35.

The square root of 116831861 is about 10808.8788040203. The cubic root of 116831861 is about 488.8629207760.

The spelling of 116831861 in words is "one hundred sixteen million, eight hundred thirty-one thousand, eight hundred sixty-one".