163321631 has 8 divisors (see below), whose sum is σ = 178263504. Its totient is φ = 148395520.

The previous prime is 163321607. The next prime is 163321633. The reversal of 163321631 is 136123361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 163321631 - 2¹⁸ = 163059487 is a prime.

It is a super-2 number, since 2×163321631² = 53347910305000322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 163321631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163321633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32141 + ... + 36873.

It is an arithmetic number, because the mean of its divisors is an integer number (22282938).

Almost surely, 2^163321631 is an apocalyptic number.

163321631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

163321631 is a deficient number, since it is larger than the sum of its proper divisors (14941873).

163321631 is a wasteful number, since it uses less digits than its factorization.

163321631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7881.

The product of its digits is 1944, while the sum is 26.

The square root of 163321631 is about 12779.7351694000. The cubic root of 163321631 is about 546.6146108886.

Adding to 163321631 its reverse (136123361), we get a palindrome (299444992).

The spelling of 163321631 in words is "one hundred sixty-three million, three hundred twenty-one thousand, six hundred thirty-one".