423090581 has 2 divisors, whose sum is σ = 423090582. Its totient is φ = 423090580.

The previous prime is 423090557. The next prime is 423090617. The reversal of 423090581 is 185090324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 420660100 + 2430481 = 20510^2 + 1559^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423090581 is a prime.

It is a super-2 number, since 2×423090581² = 358011279461835122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423096581) 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 as a sum of consecutive naturals, namely, 211545290 + 211545291.

It is an arithmetic number, because the mean of its divisors is an integer number (211545291).

Almost surely, 2^423090581 is an apocalyptic number.

It is an amenable number.

423090581 is a deficient number, since it is larger than the sum of its proper divisors (1).

423090581 is an equidigital number, since it uses as much as digits as its factorization.

423090581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 423090581 is about 20569.1657827925. The cubic root of 423090581 is about 750.7196535405.

The spelling of 423090581 in words is "four hundred twenty-three million, ninety thousand, five hundred eighty-one".