90999099 has 32 divisors (see below), whose sum is σ = 138066240. Its totient is φ = 59222016.

The previous prime is 90999059. The next prime is 90999101. The reversal of 90999099 is 99099909.

It is not a de Polignac number, because 90999099 - 2⁹ = 90998587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90999059) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 269859 + ... + 270195.

It is an arithmetic number, because the mean of its divisors is an integer number (4314570).

Almost surely, 2^90999099 is an apocalyptic number.

90999099 is a deficient number, since it is larger than the sum of its proper divisors (47067141).

90999099 is a wasteful number, since it uses less digits than its factorization.

90999099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 531441, while the sum is 54.

The square root of 90999099 is about 9539.3447888207. The cubic root of 90999099 is about 449.7926600372.

The spelling of 90999099 in words is "ninety million, nine hundred ninety-nine thousand, ninety-nine".