311330012240 has 40 divisors (see below), whose sum is σ = 779522456328. Its totient is φ = 114952619520.

The previous prime is 311330012221. The next prime is 311330012243. The reversal of 311330012240 is 42210033113.

It can be written as a sum of positive squares in 4 ways, for example, as 666465856 + 310663546384 = 25816^2 + 557372^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311330012243) 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, 149676851 + ... + 149678930.

Almost surely, 2^311330012240 is an apocalyptic number.

It is an amenable number.

311330012240 is an abundant number, since it is smaller than the sum of its proper divisors (468192444088).

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

311330012240 is a wasteful number, since it uses less digits than its factorization.

311330012240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299355807 (or 299355801 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 311330012240 its reverse (42210033113), we get a palindrome (353540045353).

The spelling of 311330012240 in words is "three hundred eleven billion, three hundred thirty million, twelve thousand, two hundred forty".