311887 has 4 divisors (see below), whose sum is σ = 319536. Its totient is φ = 304240.

The previous prime is 311881. The next prime is 311897. The reversal of 311887 is 788113.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 788113 = 31 ⋅25423.

It is a cyclic number.

It is not a de Polignac number, because 311887 - 2¹⁵ = 279119 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311881) 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, 3763 + ... + 3844.

It is an arithmetic number, because the mean of its divisors is an integer number (79884).

2³¹¹⁸⁸⁷ is an apocalyptic number.

311887 is a deficient number, since it is larger than the sum of its proper divisors (7649).

311887 is an equidigital number, since it uses as much as digits as its factorization.

311887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7648.

The product of its digits is 1344, while the sum is 28.

The square root of 311887 is about 558.4684413644. The cubic root of 311887 is about 67.8160396901.

The spelling of 311887 in words is "three hundred eleven thousand, eight hundred eighty-seven".