2533981 has 4 divisors (see below), whose sum is σ = 2538172. Its totient is φ = 2529792.

The previous prime is 2533967. The next prime is 2534009. The reversal of 2533981 is 1893352.

It is a happy number.

2533981 is nontrivially palindromic in base 9.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1232100 + 1301881 = 1110^2 + 1141^2 .

It is a cyclic number.

It is not a de Polignac number, because 2533981 - 2¹⁷ = 2402909 is a prime.

It is a super-2 number, since 2×2533981² = 12842119416722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2533081) 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, 996 + ... + 2461.

It is an arithmetic number, because the mean of its divisors is an integer number (634543).

2^2533981 is an apocalyptic number.

It is an amenable number.

2533981 is a deficient number, since it is larger than the sum of its proper divisors (4191).

2533981 is an equidigital number, since it uses as much as digits as its factorization.

2533981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4190.

The product of its digits is 6480, while the sum is 31.

The square root of 2533981 is about 1591.8482967921. The cubic root of 2533981 is about 136.3330397482. Note that the first 3 decimals are identical.

The spelling of 2533981 in words is "two million, five hundred thirty-three thousand, nine hundred eighty-one".