1312173145 has 16 divisors (see below), whose sum is σ = 1596510720. Its totient is φ = 1035183744.

The previous prime is 1312173139. The next prime is 1312173151. The reversal of 1312173145 is 5413712131.

It is an interprime number because it is at equal distance from previous prime (1312173139) and next prime (1312173151).

It is a cyclic number.

It is not a de Polignac number, because 1312173145 - 2¹⁵ = 1312140377 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249301 + ... + 254509.

It is an arithmetic number, because the mean of its divisors is an integer number (99781920).

Almost surely, 2^1312173145 is an apocalyptic number.

It is an amenable number.

1312173145 is a deficient number, since it is larger than the sum of its proper divisors (284337575).

1312173145 is an equidigital number, since it uses as much as digits as its factorization.

1312173145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5904.

The product of its digits is 2520, while the sum is 28.

The square root of 1312173145 is about 36223.9305570227. The cubic root of 1312173145 is about 1094.7888905864.

Adding to 1312173145 its reverse (5413712131), we get a palindrome (6725885276).

The spelling of 1312173145 in words is "one billion, three hundred twelve million, one hundred seventy-three thousand, one hundred forty-five".