2521687 has 12 divisors (see below), whose sum is σ = 2991816. Its totient is φ = 2118480.

The previous prime is 2521681. The next prime is 2521693. The reversal of 2521687 is 7861252.

It is an interprime number because it is at equal distance from previous prime (2521681) and next prime (2521693).

It is not a de Polignac number, because 2521687 - 2¹¹ = 2519639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521681) 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 11 ways as a sum of consecutive naturals, for example, 2112 + ... + 3082.

It is an arithmetic number, because the mean of its divisors is an integer number (249318).

2^2521687 is an apocalyptic number.

2521687 is a deficient number, since it is larger than the sum of its proper divisors (470129).

2521687 is an equidigital number, since it uses as much as digits as its factorization.

2521687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038 (or 1031 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The square root of 2521687 is about 1587.9820527953. The cubic root of 2521687 is about 136.1122019565.

It can be divided in two parts, 25 and 21687, that added together give a palindrome (21712).

The spelling of 2521687 in words is "two million, five hundred twenty-one thousand, six hundred eighty-seven".