163255691 has 2 divisors, whose sum is σ = 163255692. Its totient is φ = 163255690.

The previous prime is 163255669. The next prime is 163255699. The reversal of 163255691 is 196552361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 163255691 - 2²² = 159061387 is a prime.

It is not a weakly prime, because it can be changed into another prime (163255699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81627845 + 81627846.

It is an arithmetic number, because the mean of its divisors is an integer number (81627846).

Almost surely, 2^163255691 is an apocalyptic number.

163255691 is a deficient number, since it is larger than the sum of its proper divisors (1).

163255691 is an equidigital number, since it uses as much as digits as its factorization.

163255691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48600, while the sum is 38.

The square root of 163255691 is about 12777.1550432794. The cubic root of 163255691 is about 546.5410370064.

The spelling of 163255691 in words is "one hundred sixty-three million, two hundred fifty-five thousand, six hundred ninety-one".