249749 has 2 divisors, whose sum is σ = 249750. Its totient is φ = 249748.

The previous prime is 249737. The next prime is 249763. The reversal of 249749 is 947942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165649 + 84100 = 407^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 249749 - 2¹² = 245653 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124874 + 124875.

It is an arithmetic number, because the mean of its divisors is an integer number (124875).

2²⁴⁹⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

249749 is a deficient number, since it is larger than the sum of its proper divisors (1).

249749 is an equidigital number, since it uses as much as digits as its factorization.

249749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 249749 is about 499.7489369674. The cubic root of 249749 is about 62.9749627562.

The spelling of 249749 in words is "two hundred forty-nine thousand, seven hundred forty-nine".