164898581 has 2 divisors, whose sum is σ = 164898582. Its totient is φ = 164898580.

The previous prime is 164898541. The next prime is 164898637. The reversal of 164898581 is 185898461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164070481 + 828100 = 12809^2 + 910^2 .

It is a cyclic number.

It is not a de Polignac number, because 164898581 - 2²² = 160704277 is a prime.

It is a super-2 number, since 2×164898581² = 54383084031627122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164898541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82449290 + 82449291.

It is an arithmetic number, because the mean of its divisors is an integer number (82449291).

Almost surely, 2^164898581 is an apocalyptic number.

It is an amenable number.

164898581 is a deficient number, since it is larger than the sum of its proper divisors (1).

164898581 is an equidigital number, since it uses as much as digits as its factorization.

164898581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 552960, while the sum is 50.

The square root of 164898581 is about 12841.2842426293. The cubic root of 164898581 is about 548.3682557269.

The spelling of 164898581 in words is "one hundred sixty-four million, eight hundred ninety-eight thousand, five hundred eighty-one".