90910009091 has 8 divisors (see below), whose sum is σ = 99185573568. Its totient is φ = 82636281000.

The previous prime is 90910009079. The next prime is 90910009097. The reversal of 90910009091 is 19090001909.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 90910009091 - 2¹⁴ = 90909992707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90910009097) 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, 354545 + ... + 554546.

It is an arithmetic number, because the mean of its divisors is an integer number (12398196696).

Almost surely, 2^90910009091 is an apocalyptic number.

90910009091 is a deficient number, since it is larger than the sum of its proper divisors (8275564477).

90910009091 is a wasteful number, since it uses less digits than its factorization.

90910009091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918193.

The product of its (nonzero) digits is 6561, while the sum is 38.

The spelling of 90910009091 in words is "ninety billion, nine hundred ten million, nine thousand, ninety-one".