164333581 has 2 divisors, whose sum is σ = 164333582. Its totient is φ = 164333580.

The previous prime is 164333579. The next prime is 164333591. The reversal of 164333581 is 185333461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158886025 + 5447556 = 12605^2 + 2334^2 .

It is a cyclic number.

It is not a de Polignac number, because 164333581 - 2¹ = 164333579 is a prime.

It is a super-2 number, since 2×164333581² = 54011051688567122, which contains 22 as substring.

Together with 164333579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164333501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82166790 + 82166791.

It is an arithmetic number, because the mean of its divisors is an integer number (82166791).

Almost surely, 2^164333581 is an apocalyptic number.

It is an amenable number.

164333581 is a deficient number, since it is larger than the sum of its proper divisors (1).

164333581 is an equidigital number, since it uses as much as digits as its factorization.

164333581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 34.

The square root of 164333581 is about 12819.2660086294. The cubic root of 164333581 is about 547.7412388107.

The spelling of 164333581 in words is "one hundred sixty-four million, three hundred thirty-three thousand, five hundred eighty-one".