90910100091 has 8 divisors (see below), whose sum is σ = 121223846464. Its totient is φ = 60601543560.

The previous prime is 90910100077. The next prime is 90910100107. The reversal of 90910100091 is 19000101909.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90910100091 - 2¹⁹ = 90909575803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90910100191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1256401 + ... + 1326786.

It is an arithmetic number, because the mean of its divisors is an integer number (15152980808).

Almost surely, 2^90910100091 is an apocalyptic number.

90910100091 is a deficient number, since it is larger than the sum of its proper divisors (30313746373).

90910100091 is a wasteful number, since it uses less digits than its factorization.

90910100091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594921.

The product of its (nonzero) digits is 729, while the sum is 30.

The spelling of 90910100091 in words is "ninety billion, nine hundred ten million, one hundred thousand, ninety-one".