311947 has 4 divisors (see below), whose sum is σ = 320416. Its totient is φ = 303480.

The previous prime is 311897. The next prime is 311951. The reversal of 311947 is 749113.

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 311947 - 2¹¹ = 309899 is a prime.

It is a Duffinian number.

311947 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (311957) 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, 4179 + ... + 4252.

It is an arithmetic number, because the mean of its divisors is an integer number (80104).

2³¹¹⁹⁴⁷ is an apocalyptic number.

311947 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

311947 is a deficient number, since it is larger than the sum of its proper divisors (8469).

311947 is an equidigital number, since it uses as much as digits as its factorization.

311947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8468.

The product of its digits is 756, while the sum is 25.

The square root of 311947 is about 558.5221571254. The cubic root of 311947 is about 67.8203881683.

The spelling of 311947 in words is "three hundred eleven thousand, nine hundred forty-seven".