311531340 has 48 divisors (see below), whose sum is σ = 902371680. Its totient is φ = 80209920.

The previous prime is 311531323. The next prime is 311531347. The reversal of 311531340 is 43135113.

It is not an unprimeable number, because it can be changed into a prime (311531347) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 87781 + ... + 91260.

It is an arithmetic number, because the mean of its divisors is an integer number (18799410).

Almost surely, 2^311531340 is an apocalyptic number.

311531340 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

311531340 is an abundant number, since it is smaller than the sum of its proper divisors (590840340).

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

311531340 is a wasteful number, since it uses less digits than its factorization.

311531340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179082 (or 179080 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 311531340 is about 17650.2504231526. The cubic root of 311531340 is about 677.9025190296.

Adding to 311531340 its reverse (43135113), we get a palindrome (354666453).

The spelling of 311531340 in words is "three hundred eleven million, five hundred thirty-one thousand, three hundred forty".