3115391 has 4 divisors (see below), whose sum is σ = 3118992. Its totient is φ = 3111792.

The previous prime is 3115381. The next prime is 3115397. The reversal of 3115391 is 1935113.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1935113 = 31 ⋅62423.

It is a cyclic number.

It is not a de Polignac number, because 3115391 - 2¹⁰ = 3114367 is a prime.

It is a super-2 number, since 2×3115391² = 19411322165762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3115397) 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, 371 + ... + 2523.

It is an arithmetic number, because the mean of its divisors is an integer number (779748).

Almost surely, 2^3115391 is an apocalyptic number.

3115391 is a deficient number, since it is larger than the sum of its proper divisors (3601).

3115391 is a wasteful number, since it uses less digits than its factorization.

3115391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3600.

The product of its digits is 405, while the sum is 23.

The square root of 3115391 is about 1765.0470248693. The cubic root of 3115391 is about 146.0508829964.

The spelling of 3115391 in words is "three million, one hundred fifteen thousand, three hundred ninety-one".