2491573 has 4 divisors (see below), whose sum is σ = 2847520. Its totient is φ = 2135628.

The previous prime is 2491553. The next prime is 2491589. The reversal of 2491573 is 3751942.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3751942 = 2 ⋅1875971.

It is a cyclic number.

It is not a de Polignac number, because 2491573 - 2¹³ = 2483381 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 (2491523) 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, 177963 + ... + 177976.

It is an arithmetic number, because the mean of its divisors is an integer number (711880).

2^2491573 is an apocalyptic number.

It is an amenable number.

2491573 is a deficient number, since it is larger than the sum of its proper divisors (355947).

2491573 is an equidigital number, since it uses as much as digits as its factorization.

2491573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355946.

The product of its digits is 7560, while the sum is 31.

The square root of 2491573 is about 1578.4717292369. The cubic root of 2491573 is about 135.5682131820.

The spelling of 2491573 in words is "two million, four hundred ninety-one thousand, five hundred seventy-three".