146564581 has 2 divisors, whose sum is σ = 146564582. Its totient is φ = 146564580.

The previous prime is 146564573. The next prime is 146564611. The reversal of 146564581 is 185465641.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128459556 + 18105025 = 11334^2 + 4255^2 .

It is an emirp because it is prime and its reverse (185465641) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 146564581 - 2³ = 146564573 is a prime.

It is a super-2 number, since 2×146564581² = 42962352807411122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (146564501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73282290 + 73282291.

It is an arithmetic number, because the mean of its divisors is an integer number (73282291).

Almost surely, 2^146564581 is an apocalyptic number.

It is an amenable number.

146564581 is a deficient number, since it is larger than the sum of its proper divisors (1).

146564581 is an equidigital number, since it uses as much as digits as its factorization.

146564581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 115200, while the sum is 40.

The square root of 146564581 is about 12106.3859594844. The cubic root of 146564581 is about 527.2416092605.

The spelling of 146564581 in words is "one hundred forty-six million, five hundred sixty-four thousand, five hundred eighty-one".