163311331 has 4 divisors (see below), whose sum is σ = 164012472. Its totient is φ = 162610192.

The previous prime is 163311311. The next prime is 163311349. The reversal of 163311331 is 133113361.

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

It is a cyclic number.

It is not a de Polignac number, because 163311331 - 2¹⁹ = 162787043 is a prime.

It is a super-2 number, since 2×163311331² = 53341181665983122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163311311) 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 in 3 ways as a sum of consecutive naturals, for example, 350221 + ... + 350686.

It is an arithmetic number, because the mean of its divisors is an integer number (41003118).

Almost surely, 2^163311331 is an apocalyptic number.

163311331 is a deficient number, since it is larger than the sum of its proper divisors (701141).

163311331 is an equidigital number, since it uses as much as digits as its factorization.

163311331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701140.

The product of its digits is 486, while the sum is 22.

The square root of 163311331 is about 12779.3321812996. The cubic root of 163311331 is about 546.6031197615.

Adding to 163311331 its reverse (133113361), we get a palindrome (296424692).

The spelling of 163311331 in words is "one hundred sixty-three million, three hundred eleven thousand, three hundred thirty-one".