90986897 has 2 divisors, whose sum is σ = 90986898. Its totient is φ = 90986896.

The previous prime is 90986893. The next prime is 90986911. The reversal of 90986897 is 79868909.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57820816 + 33166081 = 7604^2 + 5759^2 .

It is an emirp because it is prime and its reverse (79868909) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90986897 - 2² = 90986893 is a prime.

It is not a weakly prime, because it can be changed into another prime (90986893) 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, 45493448 + 45493449.

It is an arithmetic number, because the mean of its divisors is an integer number (45493449).

Almost surely, 2^90986897 is an apocalyptic number.

It is an amenable number.

90986897 is a deficient number, since it is larger than the sum of its proper divisors (1).

90986897 is an equidigital number, since it uses as much as digits as its factorization.

90986897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The square root of 90986897 is about 9538.7052056346. The cubic root of 90986897 is about 449.7725550200.

The spelling of 90986897 in words is "ninety million, nine hundred eighty-six thousand, eight hundred ninety-seven".