1261482749 has 2 divisors, whose sum is σ = 1261482750. Its totient is φ = 1261482748.

The previous prime is 1261482727. The next prime is 1261482779. The reversal of 1261482749 is 9472841621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1161582724 + 99900025 = 34082^2 + 9995^2 .

It is an emirp because it is prime and its reverse (9472841621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1261482749 - 2¹² = 1261478653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261482779) 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, 630741374 + 630741375.

It is an arithmetic number, because the mean of its divisors is an integer number (630741375).

Almost surely, 2^1261482749 is an apocalyptic number.

It is an amenable number.

1261482749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261482749 is an equidigital number, since it uses as much as digits as its factorization.

1261482749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 44.

The square root of 1261482749 is about 35517.3584181031. The cubic root of 1261482749 is about 1080.5058070263.

The spelling of 1261482749 in words is "one billion, two hundred sixty-one million, four hundred eighty-two thousand, seven hundred forty-nine".