163305997 has 4 divisors (see below), whose sum is σ = 163498300. Its totient is φ = 163113696.

The previous prime is 163305977. The next prime is 163306009. The reversal of 163305997 is 799503361.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 799503361 = 31 ⋅25790431.

It can be written as a sum of positive squares in 2 ways, for example, as 6280036 + 157025961 = 2506^2 + 12531^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163305997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163305907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94872 + ... + 96577.

It is an arithmetic number, because the mean of its divisors is an integer number (40874575).

Almost surely, 2^163305997 is an apocalyptic number.

It is an amenable number.

163305997 is a deficient number, since it is larger than the sum of its proper divisors (192303).

163305997 is an equidigital number, since it uses as much as digits as its factorization.

163305997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192302.

The product of its (nonzero) digits is 153090, while the sum is 43.

The square root of 163305997 is about 12779.1234832441. The cubic root of 163305997 is about 546.5971687297.

The spelling of 163305997 in words is "one hundred sixty-three million, three hundred five thousand, nine hundred ninety-seven".