91040509 has 8 divisors (see below), whose sum is σ = 108570240. Its totient is φ = 74641776.

The previous prime is 91040507. The next prime is 91040519. The reversal of 91040509 is 90504019.

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 91040509 - 2¹ = 91040507 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91040501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282574 + ... + 282895.

It is an arithmetic number, because the mean of its divisors is an integer number (13571280).

Almost surely, 2^91040509 is an apocalyptic number.

It is an amenable number.

91040509 is a deficient number, since it is larger than the sum of its proper divisors (17529731).

91040509 is a wasteful number, since it uses less digits than its factorization.

91040509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565499.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 91040509 is about 9541.5150264515. The cubic root of 91040509 is about 449.8608771576.

The spelling of 91040509 in words is "ninety-one million, forty thousand, five hundred nine".