311977 has 4 divisors (see below), whose sum is σ = 313600. Its totient is φ = 310356.

The previous prime is 311963. The next prime is 311981. The reversal of 311977 is 779113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 779113 = 859 ⋅907.

It is a cyclic number.

It is not a de Polignac number, because 311977 - 2¹¹ = 309929 is a prime.

It is a Duffinian 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, 477 + ... + 922.

It is an arithmetic number, because the mean of its divisors is an integer number (78400).

2³¹¹⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

311977 is a deficient number, since it is larger than the sum of its proper divisors (1623).

311977 is a wasteful number, since it uses less digits than its factorization.

311977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1622.

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

The square root of 311977 is about 558.5490130687. The cubic root of 311977 is about 67.8225621983.

The spelling of 311977 in words is "three hundred eleven thousand, nine hundred seventy-seven".