408962581 has 2 divisors, whose sum is σ = 408962582. Its totient is φ = 408962580.

The previous prime is 408962569. The next prime is 408962621. The reversal of 408962581 is 185269804.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 270076356 + 138886225 = 16434^2 + 11785^2 .

It is a cyclic number.

It is not a de Polignac number, because 408962581 - 2⁹ = 408962069 is a prime.

It is a super-2 number, since 2×408962581² = 334500785316363122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (408962501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204481290 + 204481291.

It is an arithmetic number, because the mean of its divisors is an integer number (204481291).

Almost surely, 2^408962581 is an apocalyptic number.

It is an amenable number.

408962581 is a deficient number, since it is larger than the sum of its proper divisors (1).

408962581 is an equidigital number, since it uses as much as digits as its factorization.

408962581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 408962581 is about 20222.8232697613. The cubic root of 408962581 is about 742.2687741875.

The spelling of 408962581 in words is "four hundred eight million, nine hundred sixty-two thousand, five hundred eighty-one".