1287258713 has 16 divisors (see below), whose sum is σ = 1415669136. Its totient is φ = 1163289600.

The previous prime is 1287258697. The next prime is 1287258743. The reversal of 1287258713 is 3178527821.

It can be written as a sum of positive squares in 8 ways, for example, as 38837824 + 1248420889 = 6232^2 + 35333^2 .

It is a cyclic number.

It is not a de Polignac number, because 1287258713 - 2⁴ = 1287258697 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287258743) 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 in 15 ways as a sum of consecutive naturals, for example, 125063 + ... + 134963.

It is an arithmetic number, because the mean of its divisors is an integer number (88479321).

Almost surely, 2^1287258713 is an apocalyptic number.

1287258713 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1287258713 is a deficient number, since it is larger than the sum of its proper divisors (128410423).

1287258713 is a wasteful number, since it uses less digits than its factorization.

1287258713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10124.

The product of its digits is 188160, while the sum is 44.

The square root of 1287258713 is about 35878.3878260994. The cubic root of 1287258713 is about 1087.8155935775.

The spelling of 1287258713 in words is "one billion, two hundred eighty-seven million, two hundred fifty-eight thousand, seven hundred thirteen".