249931249 has 2 divisors, whose sum is σ = 249931250. Its totient is φ = 249931248.

The previous prime is 249931217. The next prime is 249931277. The reversal of 249931249 is 942139942.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235070224 + 14861025 = 15332^2 + 3855^2 .

It is a cyclic number.

It is not a de Polignac number, because 249931249 - 2⁵ = 249931217 is a prime.

It is not a weakly prime, because it can be changed into another prime (249935249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124965624 + 124965625.

It is an arithmetic number, because the mean of its divisors is an integer number (124965625).

Almost surely, 2^249931249 is an apocalyptic number.

It is an amenable number.

249931249 is a deficient number, since it is larger than the sum of its proper divisors (1).

249931249 is an equidigital number, since it uses as much as digits as its factorization.

249931249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 43.

The square root of 249931249 is about 15809.2140538358. The cubic root of 249931249 is about 629.9027724317.

The spelling of 249931249 in words is "two hundred forty-nine million, nine hundred thirty-one thousand, two hundred forty-nine".