2509631 has 4 divisors (see below), whose sum is σ = 2596200. Its totient is φ = 2423064.

The previous prime is 2509627. The next prime is 2509649. The reversal of 2509631 is 1369052.

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 2509631 - 2² = 2509627 is a prime.

It is a super-2 number, since 2×2509631² = 12596495512322, 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 2509631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2509621) 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 3 ways as a sum of consecutive naturals, for example, 43241 + ... + 43298.

It is an arithmetic number, because the mean of its divisors is an integer number (649050).

2^2509631 is an apocalyptic number.

2509631 is a deficient number, since it is larger than the sum of its proper divisors (86569).

2509631 is an equidigital number, since it uses as much as digits as its factorization.

2509631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86568.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 2509631 is about 1584.1814921277. The cubic root of 2509631 is about 135.8949412111.

The spelling of 2509631 in words is "two million, five hundred nine thousand, six hundred thirty-one".