423908081 has 2 divisors, whose sum is σ = 423908082. Its totient is φ = 423908080.

The previous prime is 423908077. The next prime is 423908113. The reversal of 423908081 is 180809324.

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., 423701056 + 207025 = 20584^2 + 455^2 .

It is a cyclic number.

It is not a de Polignac number, because 423908081 - 2² = 423908077 is a prime.

It is a super-2 number, since 2×423908081² = 359396122274205122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (423908011) 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, 211954040 + 211954041.

It is an arithmetic number, because the mean of its divisors is an integer number (211954041).

Almost surely, 2^423908081 is an apocalyptic number.

It is an amenable number.

423908081 is a deficient number, since it is larger than the sum of its proper divisors (1).

423908081 is an equidigital number, since it uses as much as digits as its factorization.

423908081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 423908081 is about 20589.0281703630. The cubic root of 423908081 is about 751.2028585511.

The spelling of 423908081 in words is "four hundred twenty-three million, nine hundred eight thousand, eighty-one".