91338439 has 4 divisors (see below), whose sum is σ = 91400400. Its totient is φ = 91276480.

The previous prime is 91338427. The next prime is 91338469. The reversal of 91338439 is 93483319.

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

It is a cyclic number.

It is not a de Polignac number, because 91338439 - 2⁹ = 91337927 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 (91338409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28714 + ... + 31735.

It is an arithmetic number, because the mean of its divisors is an integer number (22850100).

Almost surely, 2^91338439 is an apocalyptic number.

91338439 is a deficient number, since it is larger than the sum of its proper divisors (61961).

91338439 is a wasteful number, since it uses less digits than its factorization.

91338439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61960.

The product of its digits is 69984, while the sum is 40.

The square root of 91338439 is about 9557.1145750169. The cubic root of 91338439 is about 450.3510659636.

The spelling of 91338439 in words is "ninety-one million, three hundred thirty-eight thousand, four hundred thirty-nine".