1312217272 has 16 divisors (see below), whose sum is σ = 2461453560.
Its totient is φ = 655829664.
The previous prime is 1312217251. The next prime is 1312217279. The reversal of 1312217272 is 2727122131.
It is a self number, because there is not a number n which added to its sum of digits gives 1312217272.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1312217279) 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, 14158 + ... + 53149.
Almost surely, 21312217272 is an apocalyptic number.
It is an amenable number.
1312217272 is a deficient number, since it is larger than the sum of its proper divisors (1149236288).
1312217272 is a wasteful number, since it uses less digits than its factorization.
1312217272 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 69750 (or 69746 counting only the distinct ones).
The product of its digits is 2352, while the sum is 28.
The square root of 1312217272 is about 36224.5396382066.
The cubic root of 1312217272 is about 1094.8011626477.
The spelling of 1312217272 in words is "one billion, three hundred twelve million, two hundred seventeen thousand, two hundred seventy-two".