163039993 has 2 divisors, whose sum is σ = 163039994. Its totient is φ = 163039992.

The previous prime is 163039967. The next prime is 163039997. The reversal of 163039993 is 399930361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161722089 + 1317904 = 12717^2 + 1148^2 .

It is an emirp because it is prime and its reverse (399930361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163039993 - 2²¹ = 160942841 is a prime.

It is not a weakly prime, because it can be changed into another prime (163039997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81519996 + 81519997.

It is an arithmetic number, because the mean of its divisors is an integer number (81519997).

Almost surely, 2^163039993 is an apocalyptic number.

It is an amenable number.

163039993 is a deficient number, since it is larger than the sum of its proper divisors (1).

163039993 is an equidigital number, since it uses as much as digits as its factorization.

163039993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 118098, while the sum is 43.

The square root of 163039993 is about 12768.7114855024. The cubic root of 163039993 is about 546.3002291364.

The spelling of 163039993 in words is "one hundred sixty-three million, thirty-nine thousand, nine hundred ninety-three".