249881 has 2 divisors, whose sum is σ = 249882. Its totient is φ = 249880.

The previous prime is 249871. The next prime is 249911. The reversal of 249881 is 188942.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 234256 + 15625 = 484^2 + 125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249881 is a prime.

It is a super-2 number, since 2×249881² = 124881028322, which contains 22 as substring.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 249881.

It is not a weakly prime, because it can be changed into another prime (249811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124940 + 124941.

It is an arithmetic number, because the mean of its divisors is an integer number (124941).

2²⁴⁹⁸⁸¹ is an apocalyptic number.

It is an amenable number.

249881 is a deficient number, since it is larger than the sum of its proper divisors (1).

249881 is an equidigital number, since it uses as much as digits as its factorization.

249881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 32.

The square root of 249881 is about 499.8809858356. The cubic root of 249881 is about 62.9860555347.

The spelling of 249881 in words is "two hundred forty-nine thousand, eight hundred eighty-one".