311212230 has 96 divisors (see below), whose sum is σ = 876220416. Its totient is φ = 70531776.

The previous prime is 311212219. The next prime is 311212249. The reversal of 311212230 is 32212113.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 185857 + ... + 187523.

It is an arithmetic number, because the mean of its divisors is an integer number (9127296).

Almost surely, 2^311212230 is an apocalyptic number.

311212230 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 311212230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (438110208).

311212230 is an abundant number, since it is smaller than the sum of its proper divisors (565008186).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

311212230 is a wasteful number, since it uses less digits than its factorization.

311212230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818 (or 1811 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 311212230 is about 17641.2082919510. The cubic root of 311212230 is about 677.6709753079.

Adding to 311212230 its reverse (32212113), we get a palindrome (343424343).

The spelling of 311212230 in words is "three hundred eleven million, two hundred twelve thousand, two hundred thirty".