311779 has 8 divisors (see below), whose sum is σ = 347760. Its totient is φ = 277536.

The previous prime is 311749. The next prime is 311791. The reversal of 311779 is 977113.

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 311779 - 2⁵ = 311747 is a prime.

It is a super-2 number, since 2×311779² = 194412289682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311749) 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, 37 + ... + 790.

It is an arithmetic number, because the mean of its divisors is an integer number (43470).

2³¹¹⁷⁷⁹ is an apocalyptic number.

311779 is a deficient number, since it is larger than the sum of its proper divisors (35981).

311779 is a wasteful number, since it uses less digits than its factorization.

311779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869.

The product of its digits is 1323, while the sum is 28.

The square root of 311779 is about 558.3717399726. The cubic root of 311779 is about 67.8082110237.

The spelling of 311779 in words is "three hundred eleven thousand, seven hundred seventy-nine".