91000609 has 12 divisors (see below), whose sum is σ = 110480704. Its totient is φ = 73410624.

The previous prime is 91000589. The next prime is 91000639. The reversal of 91000609 is 90600019.

It is not a de Polignac number, because 91000609 - 2⁵ = 91000577 is a prime.

It is a super-2 number, since 2×91000609² = 16562221676741762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91000639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20469 + ... + 24514.

Almost surely, 2^91000609 is an apocalyptic number.

It is an amenable number.

91000609 is a deficient number, since it is larger than the sum of its proper divisors (19480095).

91000609 is a wasteful number, since it uses less digits than its factorization.

91000609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45024 (or 45007 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 91000609 is about 9539.4239343893. The cubic root of 91000609 is about 449.7951479122.

The spelling of 91000609 in words is "ninety-one million, six hundred nine", and thus it is an aban number.