2491065 has 24 divisors (see below), whose sum is σ = 4355208. Its totient is φ = 1317120.

The previous prime is 2491063. The next prime is 2491081. The reversal of 2491065 is 5601942.

It can be written as a sum of positive squares in 4 ways, for example, as 1115136 + 1375929 = 1056^2 + 1173^2 .

It is not a de Polignac number, because 2491065 - 2¹ = 2491063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491063) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8725 + ... + 9005.

It is an arithmetic number, because the mean of its divisors is an integer number (181467).

2^2491065 is an apocalyptic number.

It is an amenable number.

2491065 is a deficient number, since it is larger than the sum of its proper divisors (1864143).

2491065 is a wasteful number, since it uses less digits than its factorization.

2491065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 486 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 2491065 is about 1578.3108058934. The cubic root of 2491065 is about 135.5589990117.

The spelling of 2491065 in words is "two million, four hundred ninety-one thousand, sixty-five".