164329581 has 16 divisors (see below), whose sum is σ = 236363456. Its totient is φ = 100953216.

The previous prime is 164329577. The next prime is 164329603. The reversal of 164329581 is 185923461.

It is not a de Polignac number, because 164329581 - 2² = 164329577 is a prime.

It is a super-2 number, since 2×164329581² = 54008422383271122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164329981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21801 + ... + 28353.

It is an arithmetic number, because the mean of its divisors is an integer number (14772716).

Almost surely, 2^164329581 is an apocalyptic number.

It is an amenable number.

164329581 is a deficient number, since it is larger than the sum of its proper divisors (72033875).

164329581 is a wasteful number, since it uses less digits than its factorization.

164329581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7212.

The product of its digits is 51840, while the sum is 39.

The square root of 164329581 is about 12819.1099925073. The cubic root of 164329581 is about 547.7367946334.

The spelling of 164329581 in words is "one hundred sixty-four million, three hundred twenty-nine thousand, five hundred eighty-one".