2009881 has 2 divisors, whose sum is σ = 2009882. Its totient is φ = 2009880.

The previous prime is 2009879. The next prime is 2009897. The reversal of 2009881 is 1889002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1798281 + 211600 = 1341^2 + 460^2 .

It is a cyclic number.

It is not a de Polignac number, because 2009881 - 2¹ = 2009879 is a prime.

It is a super-2 number, since 2×2009881² = 8079243268322, which contains 22 as substring.

Together with 2009879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2009831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1004940 + 1004941.

It is an arithmetic number, because the mean of its divisors is an integer number (1004941).

2^2009881 is an apocalyptic number.

It is an amenable number.

2009881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009881 is an equidigital number, since it uses as much as digits as its factorization.

2009881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 2009881 is about 1417.7027191905. The cubic root of 2009881 is about 126.1992522244.

The spelling of 2009881 in words is "two million, nine thousand, eight hundred eighty-one".