2891281 has 2 divisors, whose sum is σ = 2891282. Its totient is φ = 2891280.

The previous prime is 2891263. The next prime is 2891293. The reversal of 2891281 is 1821982.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2531281 + 360000 = 1591^2 + 600^2 .

It is a cyclic number.

It is not a de Polignac number, because 2891281 - 2¹¹ = 2889233 is a prime.

It is a super-2 number, since 2×2891281² = 16719011641922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2891201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1445640 + 1445641.

It is an arithmetic number, because the mean of its divisors is an integer number (1445641).

2^2891281 is an apocalyptic number.

It is an amenable number.

2891281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2891281 is an equidigital number, since it uses as much as digits as its factorization.

2891281 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2891281 is about 1700.3767229646. The cubic root of 2891281 is about 142.4612554972.

The spelling of 2891281 in words is "two million, eight hundred ninety-one thousand, two hundred eighty-one".