2497681 has 4 divisors (see below), whose sum is σ = 2508912. Its totient is φ = 2486452.

The previous prime is 2497673. The next prime is 2497697. The reversal of 2497681 is 1867942.

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.

It is a cyclic number.

It is not a de Polignac number, because 2497681 - 2³ = 2497673 is a prime.

It is a super-2 number, since 2×2497681² = 12476820755522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2497681.

It is not an unprimeable number, because it can be changed into a prime (2497631) 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, 5275 + ... + 5728.

It is an arithmetic number, because the mean of its divisors is an integer number (627228).

2^2497681 is an apocalyptic number.

It is an amenable number.

2497681 is a deficient number, since it is larger than the sum of its proper divisors (11231).

2497681 is a wasteful number, since it uses less digits than its factorization.

2497681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11230.

The product of its digits is 24192, while the sum is 37.

The square root of 2497681 is about 1580.4053277561. The cubic root of 2497681 is about 135.6789029512.

The spelling of 2497681 in words is "two million, four hundred ninety-seven thousand, six hundred eighty-one".