90190190091 has 8 divisors (see below), whose sum is σ = 120282997824. Its totient is φ = 60112087880.

The previous prime is 90190190089. The next prime is 90190190093. The reversal of 90190190091 is 19009109109.

It is an interprime number because it is at equal distance from previous prime (90190190089) and next prime (90190190093).

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 90190190091 - 2¹ = 90190190089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90190190093) 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 7 ways as a sum of consecutive naturals, for example, 3662061 + ... + 3686606.

It is an arithmetic number, because the mean of its divisors is an integer number (15035374728).

Almost surely, 2^90190190091 is an apocalyptic number.

90190190091 is a deficient number, since it is larger than the sum of its proper divisors (30092807733).

90190190091 is a wasteful number, since it uses less digits than its factorization.

90190190091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7352761.

The product of its (nonzero) digits is 6561, while the sum is 39.

The spelling of 90190190091 in words is "ninety billion, one hundred ninety million, one hundred ninety thousand, ninety-one".