90090990893 has 2 divisors, whose sum is σ = 90090990894. Its totient is φ = 90090990892.

The previous prime is 90090990863. The next prime is 90090990911. The reversal of 90090990893 is 39809909009.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87510655684 + 2580335209 = 295822^2 + 50797^2 .

It is a cyclic number.

It is not a de Polignac number, because 90090990893 - 2²⁸ = 89822555437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90090990863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45045495446 + 45045495447.

It is an arithmetic number, because the mean of its divisors is an integer number (45045495447).

Almost surely, 2^90090990893 is an apocalyptic number.

It is an amenable number.

90090990893 is a deficient number, since it is larger than the sum of its proper divisors (1).

90090990893 is an equidigital number, since it uses as much as digits as its factorization.

90090990893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1417176, while the sum is 56.

The spelling of 90090990893 in words is "ninety billion, ninety million, nine hundred ninety thousand, eight hundred ninety-three".