2491237 has 4 divisors (see below), whose sum is σ = 2847136. Its totient is φ = 2135340.

The previous prime is 2491211. The next prime is 2491243. The reversal of 2491237 is 7321942.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2491237 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 (2491207) 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, 177939 + ... + 177952.

It is an arithmetic number, because the mean of its divisors is an integer number (711784).

2^2491237 is an apocalyptic number.

It is an amenable number.

2491237 is a deficient number, since it is larger than the sum of its proper divisors (355899).

2491237 is an equidigital number, since it uses as much as digits as its factorization.

2491237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355898.

The product of its digits is 3024, while the sum is 28.

The square root of 2491237 is about 1578.3652935870. The cubic root of 2491237 is about 135.5621189104.

Adding to 2491237 its product of digits (3024), we get a triangular number (2494261 = T₂₂₃₃).

The spelling of 2491237 in words is "two million, four hundred ninety-one thousand, two hundred thirty-seven".