1312217269 has 4 divisors (see below), whose sum is σ = 1431509760. Its totient is φ = 1192924780.

The previous prime is 1312217251. The next prime is 1312217279. The reversal of 1312217269 is 9627122131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1312217269 - 2¹⁵ = 1312184501 is a prime.

It is a super-2 number, since 2×1312217269² = 3443828322123636722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312217209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59646229 + ... + 59646250.

It is an arithmetic number, because the mean of its divisors is an integer number (357877440).

Almost surely, 2^1312217269 is an apocalyptic number.

It is an amenable number.

1312217269 is a deficient number, since it is larger than the sum of its proper divisors (119292491).

1312217269 is a wasteful number, since it uses less digits than its factorization.

1312217269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119292490.

The product of its digits is 9072, while the sum is 34.

The square root of 1312217269 is about 36224.5395967982. The cubic root of 1312217269 is about 1094.8011618134.

The spelling of 1312217269 in words is "one billion, three hundred twelve million, two hundred seventeen thousand, two hundred sixty-nine".