1249940689 has 2 divisors, whose sum is σ = 1249940690. Its totient is φ = 1249940688.

The previous prime is 1249940683. The next prime is 1249940779. The reversal of 1249940689 is 9860499421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 797102289 + 452838400 = 28233^2 + 21280^2 .

It is a cyclic number.

It is not a de Polignac number, because 1249940689 - 2⁹ = 1249940177 is a prime.

It is not a weakly prime, because it can be changed into another prime (1249940683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624970344 + 624970345.

It is an arithmetic number, because the mean of its divisors is an integer number (624970345).

Almost surely, 2^1249940689 is an apocalyptic number.

It is an amenable number.

1249940689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249940689 is an equidigital number, since it uses as much as digits as its factorization.

1249940689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The square root of 1249940689 is about 35354.5002651713. The cubic root of 1249940689 is about 1077.2003071897.

The spelling of 1249940689 in words is "one billion, two hundred forty-nine million, nine hundred forty thousand, six hundred eighty-nine".