1213793279 has 4 divisors (see below), whose sum is σ = 1213982376. Its totient is φ = 1213604184.

The previous prime is 1213793261. The next prime is 1213793299. The reversal of 1213793279 is 9723973121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1213793279 - 2⁸ = 1213793023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213793249) 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, 84569 + ... + 97874.

It is an arithmetic number, because the mean of its divisors is an integer number (303495594).

Almost surely, 2^1213793279 is an apocalyptic number.

1213793279 is a deficient number, since it is larger than the sum of its proper divisors (189097).

1213793279 is an equidigital number, since it uses as much as digits as its factorization.

1213793279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189096.

The product of its digits is 142884, while the sum is 44.

The square root of 1213793279 is about 34839.5361478881. The cubic root of 1213793279 is about 1066.7146086633.

The spelling of 1213793279 in words is "one billion, two hundred thirteen million, seven hundred ninety-three thousand, two hundred seventy-nine".