163503997 has 4 divisors (see below), whose sum is σ = 164407516. Its totient is φ = 162600480.

The previous prime is 163503979. The next prime is 163504021. The reversal of 163503997 is 799305361.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1425636 + 162078361 = 1194^2 + 12731^2 .

It is a cyclic number.

It is not a de Polignac number, because 163503997 - 2⁷ = 163503869 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 (163503917) 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, 451488 + ... + 451849.

It is an arithmetic number, because the mean of its divisors is an integer number (41101879).

Almost surely, 2^163503997 is an apocalyptic number.

It is an amenable number.

163503997 is a deficient number, since it is larger than the sum of its proper divisors (903519).

163503997 is an equidigital number, since it uses as much as digits as its factorization.

163503997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903518.

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

The square root of 163503997 is about 12786.8681466573. The cubic root of 163503997 is about 546.8179863589.

The spelling of 163503997 in words is "one hundred sixty-three million, five hundred three thousand, nine hundred ninety-seven".