2542681 has 2 divisors, whose sum is σ = 2542682. Its totient is φ = 2542680.

The previous prime is 2542669. The next prime is 2542699. The reversal of 2542681 is 1862452.

2542681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2250000 + 292681 = 1500^2 + 541^2 .

It is a cyclic number.

It is not a de Polignac number, because 2542681 - 2⁵ = 2542649 is a prime.

It is a super-2 number, since 2×2542681² = 12930453335522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2542621) 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 as a sum of consecutive naturals, namely, 1271340 + 1271341.

It is an arithmetic number, because the mean of its divisors is an integer number (1271341).

2^2542681 is an apocalyptic number.

2542681 is the 1009-th centered pentagonal number.

It is an amenable number.

2542681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2542681 is an equidigital number, since it uses as much as digits as its factorization.

2542681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 28.

The square root of 2542681 is about 1594.5786277258. The cubic root of 2542681 is about 136.4888870897.

It can be divided in two parts, 2542 and 681, that added together give a palindrome (3223).

The spelling of 2542681 in words is "two million, five hundred forty-two thousand, six hundred eighty-one".