1311579427 has 4 divisors (see below), whose sum is σ = 1388731176. Its totient is φ = 1234427680.

The previous prime is 1311579377. The next prime is 1311579431. The reversal of 1311579427 is 7249751131.

It is a happy number.

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 1311579427 - 2¹⁹ = 1311055139 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1311579427.

It is not an unprimeable number, because it can be changed into a prime (1311579487) 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, 38575849 + ... + 38575882.

It is an arithmetic number, because the mean of its divisors is an integer number (347182794).

Almost surely, 2^1311579427 is an apocalyptic number.

1311579427 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1311579427 is a deficient number, since it is larger than the sum of its proper divisors (77151749).

1311579427 is an equidigital number, since it uses as much as digits as its factorization.

1311579427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77151748.

The product of its digits is 52920, while the sum is 40.

The square root of 1311579427 is about 36215.7345224420. The cubic root of 1311579427 is about 1094.6237462399.

The spelling of 1311579427 in words is "one billion, three hundred eleven million, five hundred seventy-nine thousand, four hundred twenty-seven".