811961659 has 2 divisors, whose sum is σ = 811961660. Its totient is φ = 811961658.

The previous prime is 811961629. The next prime is 811961671. The reversal of 811961659 is 956169118.

It is a happy number.

811961659 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 811961659 - 2⁵ = 811961627 is a prime.

It is not a weakly prime, because it can be changed into another prime (811961629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405980829 + 405980830.

It is an arithmetic number, because the mean of its divisors is an integer number (405980830).

Almost surely, 2^811961659 is an apocalyptic number.

811961659 is a deficient number, since it is larger than the sum of its proper divisors (1).

811961659 is an equidigital number, since it uses as much as digits as its factorization.

811961659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 46.

The square root of 811961659 is about 28494.9409369453. The cubic root of 811961659 is about 932.9216550776.

The spelling of 811961659 in words is "eight hundred eleven million, nine hundred sixty-one thousand, six hundred fifty-nine".