2491965 has 48 divisors (see below), whose sum is σ = 5136768. Its totient is φ = 1135296.

The previous prime is 2491963. The next prime is 2491967. The reversal of 2491965 is 5691942.

It is an interprime number because it is at equal distance from previous prime (2491963) and next prime (2491967).

It is not a de Polignac number, because 2491965 - 2¹ = 2491963 is a prime.

It is a super-2 number, since 2×2491965² = 12419779122450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491961) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8359 + ... + 8651.

It is an arithmetic number, because the mean of its divisors is an integer number (107016).

2^2491965 is an apocalyptic number.

It is an amenable number.

2491965 is an abundant number, since it is smaller than the sum of its proper divisors (2644803).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2491965 is an equidigital number, since it uses as much as digits as its factorization.

2491965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 308 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 2491965 is about 1578.5958950916. The cubic root of 2491965 is about 135.5753224730.

The spelling of 2491965 in words is "two million, four hundred ninety-one thousand, nine hundred sixty-five".