1312816889 has 8 divisors (see below), whose sum is σ = 1331746920. Its totient is φ = 1293912576.

The previous prime is 1312816877. The next prime is 1312816903. The reversal of 1312816889 is 9886182131.

It can be written as a sum of positive squares in 4 ways, for example, as 876633664 + 436183225 = 29608^2 + 20885^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312816889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1312816829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111869 + ... + 123045.

It is an arithmetic number, because the mean of its divisors is an integer number (166468365).

Almost surely, 2^1312816889 is an apocalyptic number.

It is an amenable number.

1312816889 is a deficient number, since it is larger than the sum of its proper divisors (18930031).

1312816889 is a wasteful number, since it uses less digits than its factorization.

1312816889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12859.

The product of its digits is 165888, while the sum is 47.

The square root of 1312816889 is about 36232.8150852235. The cubic root of 1312816889 is about 1094.9678935284.

The spelling of 1312816889 in words is "one billion, three hundred twelve million, eight hundred sixteen thousand, eight hundred eighty-nine".