2678531 has 4 divisors (see below), whose sum is σ = 2703672. Its totient is φ = 2653392.

The previous prime is 2678519. The next prime is 2678539. The reversal of 2678531 is 1358762.

It is a happy number.

2678531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1358762 = 2 ⋅679381.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2678531 is a prime.

It is a super-2 number, since 2×2678531² = 14349056635922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2678539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12410 + ... + 12623.

It is an arithmetic number, because the mean of its divisors is an integer number (675918).

2^2678531 is an apocalyptic number.

2678531 is a deficient number, since it is larger than the sum of its proper divisors (25141).

2678531 is a wasteful number, since it uses less digits than its factorization.

2678531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25140.

The product of its digits is 10080, while the sum is 32.

The square root of 2678531 is about 1636.6218255908. The cubic root of 2678531 is about 138.8776073563.

The spelling of 2678531 in words is "two million, six hundred seventy-eight thousand, five hundred thirty-one".