311130231 has 8 divisors (see below), whose sum is σ = 419838720. Its totient is φ = 204920952.

The previous prime is 311130227. The next prime is 311130257. The reversal of 311130231 is 132031113.

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

It is not a de Polignac number, because 311130231 - 2² = 311130227 is a prime.

It is a super-2 number, since 2×311130231² = 193604041284226722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 311130231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311130031) 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, 624511 + ... + 625008.

It is an arithmetic number, because the mean of its divisors is an integer number (52479840).

Almost surely, 2^311130231 is an apocalyptic number.

311130231 is a deficient number, since it is larger than the sum of its proper divisors (108708489).

311130231 is a wasteful number, since it uses less digits than its factorization.

311130231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249605.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 311130231 is about 17638.8840633414. The cubic root of 311130231 is about 677.6114519151.

Adding to 311130231 its reverse (132031113), we get a palindrome (443161344).

The spelling of 311130231 in words is "three hundred eleven million, one hundred thirty thousand, two hundred thirty-one".