249421 has 2 divisors, whose sum is σ = 249422. Its totient is φ = 249420.

The previous prime is 249419. The next prime is 249427. The reversal of 249421 is 124942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236196 + 13225 = 486^2 + 115^2 .

It is a cyclic number.

It is not a de Polignac number, because 249421 - 2¹ = 249419 is a prime.

Together with 249419, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 249392 and 249401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124710 + 124711.

It is an arithmetic number, because the mean of its divisors is an integer number (124711).

2²⁴⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

249421 is a deficient number, since it is larger than the sum of its proper divisors (1).

249421 is an equidigital number, since it uses as much as digits as its factorization.

249421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 22.

The square root of 249421 is about 499.4206643702. The cubic root of 249421 is about 62.9473819492.

The spelling of 249421 in words is "two hundred forty-nine thousand, four hundred twenty-one".