90820901 has 2 divisors, whose sum is σ = 90820902. Its totient is φ = 90820900.

The previous prime is 90820879. The next prime is 90820909. The reversal of 90820901 is 10902809.

It is a Cunningham number, because it is equal to 9530²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90820900 + 1 = 9530^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 90820901 - 2¹⁰ = 90819877 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90820909) 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, 45410450 + 45410451.

It is an arithmetic number, because the mean of its divisors is an integer number (45410451).

Almost surely, 2^90820901 is an apocalyptic number.

It is an amenable number.

90820901 is a deficient number, since it is larger than the sum of its proper divisors (1).

90820901 is an equidigital number, since it uses as much as digits as its factorization.

90820901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 90820901 is about 9530.0000524659. Note that the first 4 decimals coincide. The cubic root of 90820901 is about 449.4988676468.

The spelling of 90820901 in words is "ninety million, eight hundred twenty thousand, nine hundred one".