2540991 has 4 divisors (see below), whose sum is σ = 3387992. Its totient is φ = 1693992.

The previous prime is 2540983. The next prime is 2541001. The reversal of 2540991 is 1990452.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2540991 - 2³ = 2540983 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2540981) 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, 423496 + ... + 423501.

It is an arithmetic number, because the mean of its divisors is an integer number (846998).

2^2540991 is an apocalyptic number.

2540991 is a deficient number, since it is larger than the sum of its proper divisors (847001).

2540991 is an equidigital number, since it uses as much as digits as its factorization.

2540991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847000.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 2540991 is about 1594.0486190829. The cubic root of 2540991 is about 136.4586411482.

The spelling of 2540991 in words is "two million, five hundred forty thousand, nine hundred ninety-one".