1287945349 has 2 divisors, whose sum is σ = 1287945350. Its totient is φ = 1287945348.

The previous prime is 1287945319. The next prime is 1287945359. The reversal of 1287945349 is 9435497821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1184048100 + 103897249 = 34410^2 + 10193^2 .

It is an emirp because it is prime and its reverse (9435497821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1287945349 - 2²⁹ = 751074437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1287945296 and 1287945305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287945319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643972674 + 643972675.

It is an arithmetic number, because the mean of its divisors is an integer number (643972675).

Almost surely, 2^1287945349 is an apocalyptic number.

It is an amenable number.

1287945349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287945349 is an equidigital number, since it uses as much as digits as its factorization.

1287945349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 52.

The square root of 1287945349 is about 35887.9554864860. The cubic root of 1287945349 is about 1088.0089762474.

The spelling of 1287945349 in words is "one billion, two hundred eighty-seven million, nine hundred forty-five thousand, three hundred forty-nine".