939099391 has 4 divisors (see below), whose sum is σ = 939334032. Its totient is φ = 938864752.

The previous prime is 939099379. The next prime is 939099409. The reversal of 939099391 is 193990939.

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 939099391 - 2¹⁷ = 938968319 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 (939094391) 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, 111211 + ... + 119356.

It is an arithmetic number, because the mean of its divisors is an integer number (234833508).

Almost surely, 2^939099391 is an apocalyptic number.

939099391 is a deficient number, since it is larger than the sum of its proper divisors (234641).

939099391 is a wasteful number, since it uses less digits than its factorization.

939099391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234640.

The product of its (nonzero) digits is 531441, while the sum is 52.

The square root of 939099391 is about 30644.7286005277. The cubic root of 939099391 is about 979.2731633371.

The spelling of 939099391 in words is "nine hundred thirty-nine million, ninety-nine thousand, three hundred ninety-one".