2491945 has 16 divisors (see below), whose sum is σ = 3335040. Its totient is φ = 1776384.

The previous prime is 2491933. The next prime is 2491949. The reversal of 2491945 is 5491942.

It is a cyclic number.

It is not a de Polignac number, because 2491945 - 2¹³ = 2483753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2491945.

It is not an unprimeable number, because it can be changed into a prime (2491949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 844 + ... + 2386.

It is an arithmetic number, because the mean of its divisors is an integer number (208440).

2^2491945 is an apocalyptic number.

It is an amenable number.

2491945 is a deficient number, since it is larger than the sum of its proper divisors (843095).

2491945 is a wasteful number, since it uses less digits than its factorization.

2491945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584.

The product of its digits is 12960, while the sum is 34.

The square root of 2491945 is about 1578.5895603354. The cubic root of 2491945 is about 135.5749597721.

It can be divided in two parts, 24919 and 45, that added together give a square (24964 = 158²).

The spelling of 2491945 in words is "two million, four hundred ninety-one thousand, nine hundred forty-five".