2126981 has 4 divisors (see below), whose sum is σ = 2129964. Its totient is φ = 2124000.

The previous prime is 2126963. The next prime is 2127007. The reversal of 2126981 is 1896212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1144900 + 982081 = 1070^2 + 991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2126981 is a prime.

It is a super-2 number, since 2×2126981² = 9048096348722, 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 (2126911) 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, 281 + ... + 2081.

It is an arithmetic number, because the mean of its divisors is an integer number (532491).

2^2126981 is an apocalyptic number.

It is an amenable number.

2126981 is a deficient number, since it is larger than the sum of its proper divisors (2983).

2126981 is a wasteful number, since it uses less digits than its factorization.

2126981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2982.

The product of its digits is 1728, while the sum is 29.

The square root of 2126981 is about 1458.4172928212. The cubic root of 2126981 is about 128.6040177824.

The spelling of 2126981 in words is "two million, one hundred twenty-six thousand, nine hundred eighty-one".