91275389 has 4 divisors (see below), whose sum is σ = 93501660. Its totient is φ = 89049120.

The previous prime is 91275367. The next prime is 91275403. The reversal of 91275389 is 98357219.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6543364 + 84732025 = 2558^2 + 9205^2 .

It is a cyclic number.

It is not a de Polignac number, because 91275389 - 2⁸ = 91275133 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 (91275589) 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 3 ways as a sum of consecutive naturals, for example, 1113074 + ... + 1113155.

It is an arithmetic number, because the mean of its divisors is an integer number (23375415).

Almost surely, 2^91275389 is an apocalyptic number.

It is an amenable number.

91275389 is a deficient number, since it is larger than the sum of its proper divisors (2226271).

91275389 is a wasteful number, since it uses less digits than its factorization.

91275389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2226270.

The product of its digits is 136080, while the sum is 44.

The square root of 91275389 is about 9553.8154158430. The cubic root of 91275389 is about 450.2474178499.

The spelling of 91275389 in words is "ninety-one million, two hundred seventy-five thousand, three hundred eighty-nine".