249998213 has 2 divisors, whose sum is σ = 249998214. Its totient is φ = 249998212.

The previous prime is 249998131. The next prime is 249998227. The reversal of 249998213 is 312899942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 246395809 + 3602404 = 15697^2 + 1898^2 .

It is a cyclic number.

It is not a de Polignac number, because 249998213 - 2¹² = 249994117 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249998263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124999106 + 124999107.

It is an arithmetic number, because the mean of its divisors is an integer number (124999107).

Almost surely, 2^249998213 is an apocalyptic number.

It is an amenable number.

249998213 is a deficient number, since it is larger than the sum of its proper divisors (1).

249998213 is an equidigital number, since it uses as much as digits as its factorization.

249998213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 47.

The square root of 249998213 is about 15811.3317908391. The cubic root of 249998213 is about 629.9590239579.

The spelling of 249998213 in words is "two hundred forty-nine million, nine hundred ninety-eight thousand, two hundred thirteen".