311103012 has 48 divisors (see below), whose sum is σ = 798944832. Its totient is φ = 93434880.

The previous prime is 311102983. The next prime is 311103019. The reversal of 311103012 is 210301113.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (311103019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4488 + ... + 25344.

It is an arithmetic number, because the mean of its divisors is an integer number (16644684).

Almost surely, 2^311103012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 311103012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (399472416).

311103012 is an abundant number, since it is smaller than the sum of its proper divisors (487841820).

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

311103012 is a wasteful number, since it uses less digits than its factorization.

311103012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20988 (or 20986 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 311103012 is about 17638.1124840500. The cubic root of 311103012 is about 677.5916912253.

Adding to 311103012 its reverse (210301113), we get a palindrome (521404125).

The spelling of 311103012 in words is "three hundred eleven million, one hundred three thousand, twelve".