2301991 has 4 divisors (see below), whose sum is σ = 2381400. Its totient is φ = 2222584.

The previous prime is 2301989. The next prime is 2301997. The reversal of 2301991 is 1991032.

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 2301991 - 2¹ = 2301989 is a prime.

It is a Duffinian number.

2301991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2301997) 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, 39661 + ... + 39718.

It is an arithmetic number, because the mean of its divisors is an integer number (595350).

2^2301991 is an apocalyptic number.

2301991 is a deficient number, since it is larger than the sum of its proper divisors (79409).

2301991 is an equidigital number, since it uses as much as digits as its factorization.

2301991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79408.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 2301991 is about 1517.2313600766. The cubic root of 2301991 is about 132.0386900666.

The spelling of 2301991 in words is "two million, three hundred one thousand, nine hundred ninety-one".