1312216516 has 48 divisors (see below), whose sum is σ = 2585487744. Its totient is φ = 578198016.

The previous prime is 1312216489. The next prime is 1312216523. The reversal of 1312216516 is 6156122131.

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, 1167931 + ... + 1169053.

It is an arithmetic number, because the mean of its divisors is an integer number (53864328).

Almost surely, 2^1312216516 is an apocalyptic number.

It is an amenable number.

1312216516 is a deficient number, since it is larger than the sum of its proper divisors (1273271228).

1312216516 is a wasteful number, since it uses less digits than its factorization.

1312216516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140 (or 2138 counting only the distinct ones).

The product of its digits is 2160, while the sum is 28.

The square root of 1312216516 is about 36224.5292032899. The cubic root of 1312216516 is about 1094.8009524006.

Adding to 1312216516 its reverse (6156122131), we get a palindrome (7468338647).

The spelling of 1312216516 in words is "one billion, three hundred twelve million, two hundred sixteen thousand, five hundred sixteen".