90908990999 has 2 divisors, whose sum is σ = 90908991000. Its totient is φ = 90908990998.

The previous prime is 90908990971. The next prime is 90908991011. The reversal of 90908990999 is 99909980909.

It is a strong prime.

It is an emirp because it is prime and its reverse (99909980909) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90908990999 - 2⁸ = 90908990743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90908990299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45454495499 + 45454495500.

It is an arithmetic number, because the mean of its divisors is an integer number (45454495500).

Almost surely, 2^90908990999 is an apocalyptic number.

90908990999 is a deficient number, since it is larger than the sum of its proper divisors (1).

90908990999 is an equidigital number, since it uses as much as digits as its factorization.

90908990999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38263752, while the sum is 71.

The spelling of 90908990999 in words is "ninety billion, nine hundred eight million, nine hundred ninety thousand, nine hundred ninety-nine".