90814081 has 2 divisors, whose sum is σ = 90814082. Its totient is φ = 90814080.

The previous prime is 90814079. The next prime is 90814093. The reversal of 90814081 is 18041809.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63680400 + 27133681 = 7980^2 + 5209^2 .

It is a cyclic number.

It is not a de Polignac number, because 90814081 - 2¹ = 90814079 is a prime.

It is a super-2 number, since 2×90814081² = 16494394615749122, which contains 22 as substring.

Together with 90814079, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90811081) 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, 45407040 + 45407041.

It is an arithmetic number, because the mean of its divisors is an integer number (45407041).

Almost surely, 2^90814081 is an apocalyptic number.

It is an amenable number.

90814081 is a deficient number, since it is larger than the sum of its proper divisors (1).

90814081 is an equidigital number, since it uses as much as digits as its factorization.

90814081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 90814081 is about 9529.6422283316. The cubic root of 90814081 is about 449.4876159820.

The spelling of 90814081 in words is "ninety million, eight hundred fourteen thousand, eighty-one".