1318750249 has 2 divisors, whose sum is σ = 1318750250. Its totient is φ = 1318750248.

The previous prime is 1318750243. The next prime is 1318750289. The reversal of 1318750249 is 9420578131.

It is an a-pointer prime, because the next prime (1318750289) can be obtained adding 1318750249 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1220244624 + 98505625 = 34932^2 + 9925^2 .

It is an emirp because it is prime and its reverse (9420578131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1318750249 - 2⁵ = 1318750217 is a prime.

It is not a weakly prime, because it can be changed into another prime (1318750243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659375124 + 659375125.

It is an arithmetic number, because the mean of its divisors is an integer number (659375125).

Almost surely, 2^1318750249 is an apocalyptic number.

It is an amenable number.

1318750249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318750249 is an equidigital number, since it uses as much as digits as its factorization.

1318750249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 1318750249 is about 36314.6010442081. The cubic root of 1318750249 is about 1096.6150071080.

It can be divided in two parts, 13187 and 50249, that added together give a palindrome (63436).

The spelling of 1318750249 in words is "one billion, three hundred eighteen million, seven hundred fifty thousand, two hundred forty-nine".