2115391 has 4 divisors (see below), whose sum is σ = 2147032. Its totient is φ = 2083752.

The previous prime is 2115371. The next prime is 2115397. The reversal of 2115391 is 1935112.

2115391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2115391 - 2¹¹ = 2113343 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 (2115397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15720 + ... + 15853.

It is an arithmetic number, because the mean of its divisors is an integer number (536758).

2^2115391 is an apocalyptic number.

2115391 is a deficient number, since it is larger than the sum of its proper divisors (31641).

2115391 is an equidigital number, since it uses as much as digits as its factorization.

2115391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31640.

The product of its digits is 270, while the sum is 22.

The square root of 2115391 is about 1454.4383795816. The cubic root of 2115391 is about 128.3700028268.

The spelling of 2115391 in words is "two million, one hundred fifteen thousand, three hundred ninety-one".