2491001 has 2 divisors, whose sum is σ = 2491002. Its totient is φ = 2491000.

The previous prime is 2490997. The next prime is 2491007. The reversal of 2491001 is 1001942.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2483776 + 7225 = 1576^2 + 85^2 .

It is a cyclic number.

It is not a de Polignac number, because 2491001 - 2² = 2490997 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2491007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1245500 + 1245501.

It is an arithmetic number, because the mean of its divisors is an integer number (1245501).

2^2491001 is an apocalyptic number.

It is an amenable number.

2491001 is a deficient number, since it is larger than the sum of its proper divisors (1).

2491001 is an equidigital number, since it uses as much as digits as its factorization.

2491001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 2491001 is about 1578.2905309226. The cubic root of 2491001 is about 135.5578380825.

Adding to 2491001 its reverse (1001942), we get a palindrome (3492943).

The spelling of 2491001 in words is "two million, four hundred ninety-one thousand, one".