2531616 has 24 divisors (see below), whose sum is σ = 6645744. Its totient is φ = 843840.

The previous prime is 2531611. The next prime is 2531629. The reversal of 2531616 is 6161352.

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2531611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13090 + ... + 13281.

It is an arithmetic number, because the mean of its divisors is an integer number (276906).

2^2531616 is an apocalyptic number.

It is an amenable number.

2531616 is an abundant number, since it is smaller than the sum of its proper divisors (4114128).

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

2531616 is a wasteful number, since it uses less digits than its factorization.

2531616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26384 (or 26376 counting only the distinct ones).

The product of its digits is 1080, while the sum is 24.

The square root of 2531616 is about 1591.1052762152. The cubic root of 2531616 is about 136.2906127003.

Adding to 2531616 its reverse (6161352), we get a palindrome (8692968).

The spelling of 2531616 in words is "two million, five hundred thirty-one thousand, six hundred sixteen".