163311997 has 2 divisors, whose sum is σ = 163311998. Its totient is φ = 163311996.

The previous prime is 163311989. The next prime is 163312003. The reversal of 163311997 is 799113361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125193721 + 38118276 = 11189^2 + 6174^2 .

It is a cyclic number.

It is not a de Polignac number, because 163311997 - 2³ = 163311989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163311947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81655998 + 81655999.

It is an arithmetic number, because the mean of its divisors is an integer number (81655999).

Almost surely, 2^163311997 is an apocalyptic number.

It is an amenable number.

163311997 is a deficient number, since it is larger than the sum of its proper divisors (1).

163311997 is an equidigital number, since it uses as much as digits as its factorization.

163311997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30618, while the sum is 40.

The square root of 163311997 is about 12779.3582389727. The cubic root of 163311997 is about 546.6038627946.

The spelling of 163311997 in words is "one hundred sixty-three million, three hundred eleven thousand, nine hundred ninety-seven".