391428113 has 4 divisors (see below), whose sum is σ = 392663220. Its totient is φ = 390193008.

The previous prime is 391428073. The next prime is 391428151. The reversal of 391428113 is 311824193.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 311824193 = 137 ⋅2276089.

It can be written as a sum of positive squares in 2 ways, for example, as 96687889 + 294740224 = 9833^2 + 17168^2 .

It is a cyclic number.

It is not a de Polignac number, because 391428113 - 2¹⁴ = 391411729 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 391428113.

It is not an unprimeable number, because it can be changed into a prime (391428013) 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, 617078 + ... + 617711.

It is an arithmetic number, because the mean of its divisors is an integer number (98165805).

Almost surely, 2^391428113 is an apocalyptic number.

It is an amenable number.

391428113 is a deficient number, since it is larger than the sum of its proper divisors (1235107).

391428113 is a wasteful number, since it uses less digits than its factorization.

391428113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235106.

The product of its digits is 5184, while the sum is 32.

The square root of 391428113 is about 19784.5422742099. The cubic root of 391428113 is about 731.5050658360.

The spelling of 391428113 in words is "three hundred ninety-one million, four hundred twenty-eight thousand, one hundred thirteen".