90331891 has 8 divisors (see below), whose sum is σ = 98930160. Its totient is φ = 81969312.

The previous prime is 90331889. The next prime is 90331907. The reversal of 90331891 is 19813309.

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 90331891 - 2¹ = 90331889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90331811) 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, 58120 + ... + 59653.

It is an arithmetic number, because the mean of its divisors is an integer number (12366270).

Almost surely, 2^90331891 is an apocalyptic number.

90331891 is a deficient number, since it is larger than the sum of its proper divisors (8598269).

90331891 is a wasteful number, since it uses less digits than its factorization.

90331891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117845.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 90331891 is about 9504.3090753616. The cubic root of 90331891 is about 448.6906647908.

The spelling of 90331891 in words is "ninety million, three hundred thirty-one thousand, eight hundred ninety-one".