2540981 has 2 divisors, whose sum is σ = 2540982. Its totient is φ = 2540980.

The previous prime is 2540969. The next prime is 2540983. The reversal of 2540981 is 1890452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2002225 + 538756 = 1415^2 + 734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2540981 is a prime.

It is a super-2 number, since 2×2540981² = 12913168884722, which contains 22 as substring.

Together with 2540983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2540983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1270490 + 1270491.

It is an arithmetic number, because the mean of its divisors is an integer number (1270491).

2^2540981 is an apocalyptic number.

It is an amenable number.

2540981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2540981 is an equidigital number, since it uses as much as digits as its factorization.

2540981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 2540981 is about 1594.0454824126. The cubic root of 2540981 is about 136.4584621382.

The spelling of 2540981 in words is "two million, five hundred forty thousand, nine hundred eighty-one".