90806281 has 2 divisors, whose sum is σ = 90806282. Its totient is φ = 90806280.

The previous prime is 90806249. The next prime is 90806293. The reversal of 90806281 is 18260809.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90725625 + 80656 = 9525^2 + 284^2 .

It is a cyclic number.

It is not a de Polignac number, because 90806281 - 2⁵ = 90806249 is a prime.

It is a super-2 number, since 2×90806281² = 16491561338101922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90806201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45403140 + 45403141.

It is an arithmetic number, because the mean of its divisors is an integer number (45403141).

Almost surely, 2^90806281 is an apocalyptic number.

It is an amenable number.

90806281 is a deficient number, since it is larger than the sum of its proper divisors (1).

90806281 is an equidigital number, since it uses as much as digits as its factorization.

90806281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 90806281 is about 9529.2329701818. The cubic root of 90806281 is about 449.4747468184.

The spelling of 90806281 in words is "ninety million, eight hundred six thousand, two hundred eighty-one".