249745313 has 2 divisors, whose sum is σ = 249745314. Its totient is φ = 249745312.

The previous prime is 249745267. The next prime is 249745387. The reversal of 249745313 is 313547942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133795489 + 115949824 = 11567^2 + 10768^2 .

It is a cyclic number.

It is not a de Polignac number, because 249745313 - 2⁸ = 249745057 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (249745513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124872656 + 124872657.

It is an arithmetic number, because the mean of its divisors is an integer number (124872657).

Almost surely, 2^249745313 is an apocalyptic number.

It is an amenable number.

249745313 is a deficient number, since it is larger than the sum of its proper divisors (1).

249745313 is an equidigital number, since it uses as much as digits as its factorization.

249745313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 38.

The square root of 249745313 is about 15803.3323384658. The cubic root of 249745313 is about 629.7465285866.

The spelling of 249745313 in words is "two hundred forty-nine million, seven hundred forty-five thousand, three hundred thirteen".