29881 has 2 divisors, whose sum is σ = 29882. Its totient is φ = 29880.

The previous prime is 29879. The next prime is 29917. The reversal of 29881 is 18892.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19881 + 10000 = 141^2 + 100^2 .

It is a cyclic number.

It is not a de Polignac number, because 29881 - 2¹ = 29879 is a prime.

It is a super-2 number, since 2×29881² = 1785748322, which contains 22 as substring.

Together with 29879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (29851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14940 + 14941.

It is an arithmetic number, because the mean of its divisors is an integer number (14941).

2²⁹⁸⁸¹ is an apocalyptic number.

It is an amenable number.

29881 is a deficient number, since it is larger than the sum of its proper divisors (1).

29881 is an equidigital number, since it uses as much as digits as its factorization.

29881 is an odious number, because the sum of its binary digits is odd.

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

The square root of 29881 is about 172.8612160087. The cubic root of 29881 is about 31.0311860980.

The spelling of 29881 in words is "twenty-nine thousand, eight hundred eighty-one".