163900091 has 2 divisors, whose sum is σ = 163900092. Its totient is φ = 163900090.

The previous prime is 163900063. The next prime is 163900127. The reversal of 163900091 is 190009361.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 163900091 - 2¹⁰ = 163899067 is a prime.

It is not a weakly prime, because it can be changed into another prime (163900031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81950045 + 81950046.

It is an arithmetic number, because the mean of its divisors is an integer number (81950046).

Almost surely, 2^163900091 is an apocalyptic number.

163900091 is a deficient number, since it is larger than the sum of its proper divisors (1).

163900091 is an equidigital number, since it uses as much as digits as its factorization.

163900091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 163900091 is about 12802.3470894989. The cubic root of 163900091 is about 547.2591920022.

The spelling of 163900091 in words is "one hundred sixty-three million, nine hundred thousand, ninety-one".