1258117165 has 4 divisors (see below), whose sum is σ = 1509740604. Its totient is φ = 1006493728.

The previous prime is 1258117153. The next prime is 1258117171. The reversal of 1258117165 is 5617118521.

1258117165 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 249292521 + 1008824644 = 15789^2 + 31762^2 .

It is a cyclic number.

It is not a de Polignac number, because 1258117165 - 2⁷ = 1258117037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 125811712 + ... + 125811721.

It is an arithmetic number, because the mean of its divisors is an integer number (377435151).

Almost surely, 2^1258117165 is an apocalyptic number.

It is an amenable number.

1258117165 is a deficient number, since it is larger than the sum of its proper divisors (251623439).

1258117165 is an equidigital number, since it uses as much as digits as its factorization.

1258117165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251623438.

The product of its digits is 16800, while the sum is 37.

The square root of 1258117165 is about 35469.9473498341. The cubic root of 1258117165 is about 1079.5440362052.

The spelling of 1258117165 in words is "one billion, two hundred fifty-eight million, one hundred seventeen thousand, one hundred sixty-five".