91388339 has 4 divisors (see below), whose sum is σ = 104443824. Its totient is φ = 78332856.

The previous prime is 91388327. The next prime is 91388369. The reversal of 91388339 is 93388319.

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

It is not a de Polignac number, because 91388339 - 2⁸ = 91388083 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91388339.

It is not an unprimeable number, because it can be changed into a prime (91388369) 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, 6527732 + ... + 6527745.

It is an arithmetic number, because the mean of its divisors is an integer number (26110956).

Almost surely, 2^91388339 is an apocalyptic number.

91388339 is a deficient number, since it is larger than the sum of its proper divisors (13055485).

91388339 is a wasteful number, since it uses less digits than its factorization.

91388339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13055484.

The product of its digits is 139968, while the sum is 44.

The square root of 91388339 is about 9559.7248391363. The cubic root of 91388339 is about 450.4330629383.

The spelling of 91388339 in words is "ninety-one million, three hundred eighty-eight thousand, three hundred thirty-nine".