1311672779 has 8 divisors (see below), whose sum is σ = 1369019232. Its totient is φ = 1255533760.

The previous prime is 1311672767. The next prime is 1311672793. The reversal of 1311672779 is 9772761131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1311672779 - 2¹⁶ = 1311607243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311672709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299639 + ... + 303984.

It is an arithmetic number, because the mean of its divisors is an integer number (171127404).

Almost surely, 2^1311672779 is an apocalyptic number.

1311672779 is a deficient number, since it is larger than the sum of its proper divisors (57346453).

1311672779 is an equidigital number, since it uses as much as digits as its factorization.

1311672779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603717.

The product of its digits is 111132, while the sum is 44.

The square root of 1311672779 is about 36217.0233315771. The cubic root of 1311672779 is about 1094.6497156652.

The spelling of 1311672779 in words is "one billion, three hundred eleven million, six hundred seventy-two thousand, seven hundred seventy-nine".