1249849789 has 2 divisors, whose sum is σ = 1249849790. Its totient is φ = 1249849788.

The previous prime is 1249849787. The next prime is 1249849793. The reversal of 1249849789 is 9879489421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 682933689 + 566916100 = 26133^2 + 23810^2 .

It is a cyclic number.

It is not a de Polignac number, because 1249849789 - 2¹ = 1249849787 is a prime.

Together with 1249849787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1249849787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624924894 + 624924895.

It is an arithmetic number, because the mean of its divisors is an integer number (624924895).

Almost surely, 2^1249849789 is an apocalyptic number.

It is an amenable number.

1249849789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1249849789 is an equidigital number, since it uses as much as digits as its factorization.

1249849789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10450944, while the sum is 61.

The square root of 1249849789 is about 35353.2146911706. The cubic root of 1249849789 is about 1077.1741939822.

The spelling of 1249849789 in words is "one billion, two hundred forty-nine million, eight hundred forty-nine thousand, seven hundred eighty-nine".