2491491 has 4 divisors (see below), whose sum is σ = 3321992. Its totient is φ = 1660992.

The previous prime is 2491487. The next prime is 2491493. The reversal of 2491491 is 1941942.

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

It is not a de Polignac number, because 2491491 - 2² = 2491487 is a prime.

It is a D-number.

It is a Duffinian number.

2491491 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491493) 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, 415246 + ... + 415251.

It is an arithmetic number, because the mean of its divisors is an integer number (830498).

2^2491491 is an apocalyptic number.

2491491 is a deficient number, since it is larger than the sum of its proper divisors (830501).

2491491 is an equidigital number, since it uses as much as digits as its factorization.

2491491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830500.

The product of its digits is 2592, while the sum is 30.

The square root of 2491491 is about 1578.4457545320. The cubic root of 2491491 is about 135.5667259400.

The spelling of 2491491 in words is "two million, four hundred ninety-one thousand, four hundred ninety-one".