90831009 has 8 divisors (see below), whose sum is σ = 121152672. Its totient is φ = 60531680.

The previous prime is 90830989. The next prime is 90831019. The reversal of 90831009 is 90013809.

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 90831009 - 2⁵ = 90830977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90831019) 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, 10669 + ... + 17189.

It is an arithmetic number, because the mean of its divisors is an integer number (15144084).

Almost surely, 2^90831009 is an apocalyptic number.

It is an amenable number.

90831009 is a deficient number, since it is larger than the sum of its proper divisors (30321663).

90831009 is a wasteful number, since it uses less digits than its factorization.

90831009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11167.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 90831009 is about 9530.5303629966. The cubic root of 90831009 is about 449.5155428319.

The spelling of 90831009 in words is "ninety million, eight hundred thirty-one thousand, nine".