90490191 has 8 divisors (see below), whose sum is σ = 131622144. Its totient is φ = 54842520.

The previous prime is 90490187. The next prime is 90490193. The reversal of 90490191 is 19109409.

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

It is not a de Polignac number, because 90490191 - 2² = 90490187 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 2742127 = 90490191 / (9 + 0 + 4 + 9 + 0 + 1 + 9 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90490193) 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, 1371031 + ... + 1371096.

It is an arithmetic number, because the mean of its divisors is an integer number (16452768).

Almost surely, 2^90490191 is an apocalyptic number.

90490191 is a deficient number, since it is larger than the sum of its proper divisors (41131953).

90490191 is a wasteful number, since it uses less digits than its factorization.

90490191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2742141.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 90490191 is about 9512.6332316557. The cubic root of 90490191 is about 448.9526109744.

The spelling of 90490191 in words is "ninety million, four hundred ninety thousand, one hundred ninety-one".