2591965 has 8 divisors (see below), whose sum is σ = 3169368. Its totient is φ = 2034240.

The previous prime is 2591921. The next prime is 2591969. The reversal of 2591965 is 5691952.

It can be written as a sum of positive squares in 4 ways, for example, as 395641 + 2196324 = 629^2 + 1482^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2591965 - 2⁹ = 2591453 is a prime.

It is a super-2 number, since 2×2591965² = 13436565122450, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2591969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4626 + ... + 5155.

It is an arithmetic number, because the mean of its divisors is an integer number (396171).

2^2591965 is an apocalyptic number.

It is an amenable number.

2591965 is a deficient number, since it is larger than the sum of its proper divisors (577403).

2591965 is an equidigital number, since it uses as much as digits as its factorization.

2591965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9839.

The product of its digits is 24300, while the sum is 37.

The square root of 2591965 is about 1609.9580739883. The cubic root of 2591965 is about 137.3650908166.

The spelling of 2591965 in words is "two million, five hundred ninety-one thousand, nine hundred sixty-five".