90900008869 has 2 divisors, whose sum is σ = 90900008870. Its totient is φ = 90900008868.

The previous prime is 90900008863. The next prime is 90900008887. The reversal of 90900008869 is 96880000909.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68192532769 + 22707476100 = 261137^2 + 150690^2 .

It is a cyclic number.

It is not a de Polignac number, because 90900008869 - 2³ = 90900008861 is a prime.

It is a super-2 number, since 2×90900008869² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90900008861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45450004434 + 45450004435.

It is an arithmetic number, because the mean of its divisors is an integer number (45450004435).

Almost surely, 2^90900008869 is an apocalyptic number.

It is an amenable number.

90900008869 is a deficient number, since it is larger than the sum of its proper divisors (1).

90900008869 is an equidigital number, since it uses as much as digits as its factorization.

90900008869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 49.

The spelling of 90900008869 in words is "ninety billion, nine hundred million, eight thousand, eight hundred sixty-nine".