164221631 has 8 divisors (see below), whose sum is σ = 187764864. Its totient is φ = 140699160.

The previous prime is 164221627. The next prime is 164221667. The reversal of 164221631 is 136122461.

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

It is not a de Polignac number, because 164221631 - 2² = 164221627 is a prime.

It is a super-2 number, since 2×164221631² = 53937488176600322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 164221631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164221331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19796 + ... + 26838.

It is an arithmetic number, because the mean of its divisors is an integer number (23470608).

Almost surely, 2^164221631 is an apocalyptic number.

164221631 is a deficient number, since it is larger than the sum of its proper divisors (23543233).

164221631 is an equidigital number, since it uses as much as digits as its factorization.

164221631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10381.

The product of its digits is 1728, while the sum is 26.

The square root of 164221631 is about 12814.8987900802. The cubic root of 164221631 is about 547.6168301517.

The spelling of 164221631 in words is "one hundred sixty-four million, two hundred twenty-one thousand, six hundred thirty-one".