2490991 has 4 divisors (see below), whose sum is σ = 2494800. Its totient is φ = 2487184.

The previous prime is 2490973. The next prime is 2490997. The reversal of 2490991 is 1990942.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1990942 = 2 ⋅995471.

It is a cyclic number.

It is not a de Polignac number, because 2490991 - 2⁹ = 2490479 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 (2490997) 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, 646 + ... + 2323.

It is an arithmetic number, because the mean of its divisors is an integer number (623700).

2^2490991 is an apocalyptic number.

2490991 is a deficient number, since it is larger than the sum of its proper divisors (3809).

2490991 is an equidigital number, since it uses as much as digits as its factorization.

2490991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3808.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 2490991 is about 1578.2873629349. The cubic root of 2490991 is about 135.5576566856.

It can be divided in two parts, 2490 and 991, that added together give a square (3481 = 59²).

The spelling of 2490991 in words is "two million, four hundred ninety thousand, nine hundred ninety-one".