90091225906 has 24 divisors (see below), whose sum is σ = 154997059392. Its totient is φ = 39170095800.

The previous prime is 90091225891. The next prime is 90091225907. The reversal of 90091225906 is 60952219009.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (90091225907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8087430 + ... + 8098561.

It is an arithmetic number, because the mean of its divisors is an integer number (6458210808).

Almost surely, 2^90091225906 is an apocalyptic number.

90091225906 is a deficient number, since it is larger than the sum of its proper divisors (64905833486).

90091225906 is a wasteful number, since it uses less digits than its factorization.

90091225906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16186038 (or 16186027 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 43.

The spelling of 90091225906 in words is "ninety billion, ninety-one million, two hundred twenty-five thousand, nine hundred six".