90991163 has 2 divisors, whose sum is σ = 90991164. Its totient is φ = 90991162.

The previous prime is 90991111. The next prime is 90991181. The reversal of 90991163 is 36119909.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90991163 - 2¹⁸ = 90729019 is a prime.

It is not a weakly prime, because it can be changed into another prime (90991193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45495581 + 45495582.

It is an arithmetic number, because the mean of its divisors is an integer number (45495582).

Almost surely, 2^90991163 is an apocalyptic number.

90991163 is a deficient number, since it is larger than the sum of its proper divisors (1).

90991163 is an equidigital number, since it uses as much as digits as its factorization.

90991163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 90991163 is about 9538.9288182689. The cubic root of 90991163 is about 449.7795842362.

The spelling of 90991163 in words is "ninety million, nine hundred ninety-one thousand, one hundred sixty-three".