163198591 has 2 divisors, whose sum is σ = 163198592. Its totient is φ = 163198590.

The previous prime is 163198531. The next prime is 163198597. The reversal of 163198591 is 195891361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 163198591 - 2⁷ = 163198463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163198597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81599295 + 81599296.

It is an arithmetic number, because the mean of its divisors is an integer number (81599296).

Almost surely, 2^163198591 is an apocalyptic number.

163198591 is a deficient number, since it is larger than the sum of its proper divisors (1).

163198591 is an equidigital number, since it uses as much as digits as its factorization.

163198591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 43.

The square root of 163198591 is about 12774.9203911414. The cubic root of 163198591 is about 546.4773105249.

The spelling of 163198591 in words is "one hundred sixty-three million, one hundred ninety-eight thousand, five hundred ninety-one".