2812981 has 4 divisors (see below), whose sum is σ = 2816352. Its totient is φ = 2809612.

The previous prime is 2812967. The next prime is 2812993. The reversal of 2812981 is 1892182.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1892182 = 2 ⋅946091.

It is a cyclic number.

It is not a de Polignac number, because 2812981 - 2⁷ = 2812853 is a prime.

It is a super-2 number, since 2×2812981² = 15825724212722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2812961) 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, 600 + ... + 2446.

It is an arithmetic number, because the mean of its divisors is an integer number (704088).

2^2812981 is an apocalyptic number.

It is an amenable number.

2812981 is a deficient number, since it is larger than the sum of its proper divisors (3371).

2812981 is a wasteful number, since it uses less digits than its factorization.

2812981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3370.

The product of its digits is 2304, while the sum is 31.

The square root of 2812981 is about 1677.1943834869. The cubic root of 2812981 is about 141.1634507771.

It can be divided in two parts, 2812 and 981, that multiplied together give a palindrome (2758572).

The spelling of 2812981 in words is "two million, eight hundred twelve thousand, nine hundred eighty-one".