91601309 has 12 divisors (see below), whose sum is σ = 94862016. Its totient is φ = 88443432.

The previous prime is 91601297. The next prime is 91601327. The reversal of 91601309 is 90310619.

It is not a de Polignac number, because 91601309 - 2¹² = 91597213 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 (91601399) 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 11 ways as a sum of consecutive naturals, for example, 197612 + ... + 198074.

It is an arithmetic number, because the mean of its divisors is an integer number (7905168).

Almost surely, 2^91601309 is an apocalyptic number.

It is an amenable number.

91601309 is a deficient number, since it is larger than the sum of its proper divisors (3260707).

91601309 is a wasteful number, since it uses less digits than its factorization.

91601309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656 (or 613 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 91601309 is about 9570.8572761274. The cubic root of 91601309 is about 450.7826856212.

The spelling of 91601309 in words is "ninety-one million, six hundred one thousand, three hundred nine".