2531287 has 4 divisors (see below), whose sum is σ = 2761416. Its totient is φ = 2301160.

The previous prime is 2531267. The next prime is 2531293. The reversal of 2531287 is 7821352.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2531287 - 2¹¹ = 2529239 is a prime.

It is a Duffinian number.

2531287 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2531267) 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, 115048 + ... + 115069.

It is an arithmetic number, because the mean of its divisors is an integer number (690354).

2^2531287 is an apocalyptic number.

2531287 is a deficient number, since it is larger than the sum of its proper divisors (230129).

2531287 is a wasteful number, since it uses less digits than its factorization.

2531287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230128.

The product of its digits is 3360, while the sum is 28.

The square root of 2531287 is about 1591.0018856054. The cubic root of 2531287 is about 136.2847084934.

It can be divided in two parts, 253 and 1287, that added together give a triangular number (1540 = T₅₅).

The spelling of 2531287 in words is "two million, five hundred thirty-one thousand, two hundred eighty-seven".