1313218897 has 4 divisors (see below), whose sum is σ = 1313373796. Its totient is φ = 1313064000.

The previous prime is 1313218853. The next prime is 1313218903. The reversal of 1313218897 is 7988123131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7988123131 = 1297 ⋅6158923.

It can be written as a sum of positive squares in 2 ways, for example, as 329204736 + 984014161 = 18144^2 + 31369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1313218897 is a prime.

It is a super-3 number, since 3×1313218897³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1313218297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63948 + ... + 81949.

It is an arithmetic number, because the mean of its divisors is an integer number (328343449).

Almost surely, 2^1313218897 is an apocalyptic number.

It is an amenable number.

1313218897 is a deficient number, since it is larger than the sum of its proper divisors (154899).

1313218897 is an equidigital number, since it uses as much as digits as its factorization.

1313218897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154898.

The product of its digits is 72576, while the sum is 43.

The square root of 1313218897 is about 36238.3622284451. The cubic root of 1313218897 is about 1095.0796483698.

The spelling of 1313218897 in words is "one billion, three hundred thirteen million, two hundred eighteen thousand, eight hundred ninety-seven".