2909281 has 2 divisors, whose sum is σ = 2909282. Its totient is φ = 2909280.

The previous prime is 2909279. The next prime is 2909311. The reversal of 2909281 is 1829092.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2560000 + 349281 = 1600^2 + 591^2 .

It is a cyclic number.

It is not a de Polignac number, because 2909281 - 2¹ = 2909279 is a prime.

It is a super-2 number, since 2×2909281² = 16927831873922, which contains 22 as substring.

Together with 2909279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2909581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1454640 + 1454641.

It is an arithmetic number, because the mean of its divisors is an integer number (1454641).

2^2909281 is an apocalyptic number.

It is an amenable number.

2909281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2909281 is an equidigital number, since it uses as much as digits as its factorization.

2909281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 2909281 is about 1705.6614552718. The cubic root of 2909281 is about 142.7562803755.

The spelling of 2909281 in words is "two million, nine hundred nine thousand, two hundred eighty-one".