91385643 has 8 divisors (see below), whose sum is σ = 121924048. Its totient is φ = 60885504.

The previous prime is 91385639. The next prime is 91385677. The reversal of 91385643 is 34658319.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91385643 - 2² = 91385639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91385683) 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, 3430 + ... + 13947.

It is an arithmetic number, because the mean of its divisors is an integer number (15240506).

Almost surely, 2^91385643 is an apocalyptic number.

91385643 is a deficient number, since it is larger than the sum of its proper divisors (30538405).

91385643 is a wasteful number, since it uses less digits than its factorization.

91385643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19133.

The product of its digits is 77760, while the sum is 39.

The square root of 91385643 is about 9559.5838298537. The cubic root of 91385643 is about 450.4286335640.

The spelling of 91385643 in words is "ninety-one million, three hundred eighty-five thousand, six hundred forty-three".