116651681 has 2 divisors, whose sum is σ = 116651682. Its totient is φ = 116651680.

The previous prime is 116651669. The next prime is 116651687. The reversal of 116651681 is 186156611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104366656 + 12285025 = 10216^2 + 3505^2 .

It is a cyclic number.

It is not a de Polignac number, because 116651681 - 2⁶ = 116651617 is a prime.

It is a super-2 number, since 2×116651681² = 27215229360251522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (116651687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58325840 + 58325841.

It is an arithmetic number, because the mean of its divisors is an integer number (58325841).

Almost surely, 2^116651681 is an apocalyptic number.

It is an amenable number.

116651681 is a deficient number, since it is larger than the sum of its proper divisors (1).

116651681 is an equidigital number, since it uses as much as digits as its factorization.

116651681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 35.

The square root of 116651681 is about 10800.5407734983. The cubic root of 116651681 is about 488.6114806855.

The spelling of 116651681 in words is "one hundred sixteen million, six hundred fifty-one thousand, six hundred eighty-one".