311145 has 8 divisors (see below), whose sum is σ = 497856. Its totient is φ = 165936.

The previous prime is 311137. The next prime is 311153. The reversal of 311145 is 541113.

It is an interprime number because it is at equal distance from previous prime (311137) and next prime (311153).

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

It is not a de Polignac number, because 311145 - 2³ = 311137 is a prime.

It is a super-2 number, since 2×311145² = 193622422050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 20743 = 311145 / (3 + 1 + 1 + 1 + 4 + 5).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10357 + ... + 10386.

It is an arithmetic number, because the mean of its divisors is an integer number (62232).

2³¹¹¹⁴⁵ is an apocalyptic number.

It is an amenable number.

311145 is a deficient number, since it is larger than the sum of its proper divisors (186711).

311145 is a wasteful number, since it uses less digits than its factorization.

311145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20751.

The product of its digits is 60, while the sum is 15.

The square root of 311145 is about 557.8037289226. The cubic root of 311145 is about 67.7622173562.

Adding to 311145 its reverse (541113), we get a palindrome (852258).

It can be divided in two parts, 31 and 1145, that added together give a triangular number (1176 = T₄₈).

The spelling of 311145 in words is "three hundred eleven thousand, one hundred forty-five".