938665091 has 16 divisors (see below), whose sum is σ = 1160140800. Its totient is φ = 739555488.

The previous prime is 938665073. The next prime is 938665093. The reversal of 938665091 is 190566839.

It is a de Polignac number, because none of the positive numbers 2^k-938665091 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (938665093) 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 15 ways as a sum of consecutive naturals, for example, 170 + ... + 43328.

It is an arithmetic number, because the mean of its divisors is an integer number (72508800).

Almost surely, 2^938665091 is an apocalyptic number.

938665091 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

938665091 is a deficient number, since it is larger than the sum of its proper divisors (221475709).

938665091 is a wasteful number, since it uses less digits than its factorization.

938665091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43418.

The product of its (nonzero) digits is 349920, while the sum is 47.

The square root of 938665091 is about 30637.6417336583. The cubic root of 938665091 is about 979.1221804140.

The spelling of 938665091 in words is "nine hundred thirty-eight million, six hundred sixty-five thousand, ninety-one".