1245781349 has 2 divisors, whose sum is σ = 1245781350. Its totient is φ = 1245781348.

The previous prime is 1245781343. The next prime is 1245781357. The reversal of 1245781349 is 9431875421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1193218849 + 52562500 = 34543^2 + 7250^2 .

It is an emirp because it is prime and its reverse (9431875421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1245781349 - 2²⁰ = 1244732773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1245781343) 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, 622890674 + 622890675.

It is an arithmetic number, because the mean of its divisors is an integer number (622890675).

Almost surely, 2^1245781349 is an apocalyptic number.

It is an amenable number.

1245781349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245781349 is an equidigital number, since it uses as much as digits as its factorization.

1245781349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 44.

The square root of 1245781349 is about 35295.6279020504. The cubic root of 1245781349 is about 1076.0041380902.

The spelling of 1245781349 in words is "one billion, two hundred forty-five million, seven hundred eighty-one thousand, three hundred forty-nine".