116781209 has 2 divisors, whose sum is σ = 116781210. Its totient is φ = 116781208.

The previous prime is 116781169. The next prime is 116781221. The reversal of 116781209 is 902187611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111619225 + 5161984 = 10565^2 + 2272^2 .

It is a cyclic number.

It is not a de Polignac number, because 116781209 - 2⁸ = 116780953 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (116781299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58390604 + 58390605.

It is an arithmetic number, because the mean of its divisors is an integer number (58390605).

Almost surely, 2^116781209 is an apocalyptic number.

It is an amenable number.

116781209 is a deficient number, since it is larger than the sum of its proper divisors (1).

116781209 is an equidigital number, since it uses as much as digits as its factorization.

116781209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 35.

The square root of 116781209 is about 10806.5354762755. The cubic root of 116781209 is about 488.7922623563.

The spelling of 116781209 in words is "one hundred sixteen million, seven hundred eighty-one thousand, two hundred nine".