1287311293 has 2 divisors, whose sum is σ = 1287311294. Its totient is φ = 1287311292.

The previous prime is 1287311269. The next prime is 1287311309. The reversal of 1287311293 is 3921137821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 787475844 + 499835449 = 28062^2 + 22357^2 .

It is a cyclic number.

It is not a de Polignac number, because 1287311293 - 2²⁹ = 750440381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287311203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643655646 + 643655647.

It is an arithmetic number, because the mean of its divisors is an integer number (643655647).

Almost surely, 2^1287311293 is an apocalyptic number.

It is an amenable number.

1287311293 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287311293 is an equidigital number, since it uses as much as digits as its factorization.

1287311293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 1287311293 is about 35879.1205717197. The cubic root of 1287311293 is about 1087.8304045254.

The spelling of 1287311293 in words is "one billion, two hundred eighty-seven million, three hundred eleven thousand, two hundred ninety-three".