311145340 has 24 divisors (see below), whose sum is σ = 712806192. Its totient is φ = 113143680.

The previous prime is 311145299. The next prime is 311145343. The reversal of 311145340 is 43541113.

It is a super-2 number, since 2×311145340² = 193622845207431200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311145343) 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, 706929 + ... + 707368.

It is an arithmetic number, because the mean of its divisors is an integer number (29700258).

Almost surely, 2^311145340 is an apocalyptic number.

It is an amenable number.

311145340 is an abundant number, since it is smaller than the sum of its proper divisors (401660852).

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

311145340 is a wasteful number, since it uses less digits than its factorization.

311145340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414317 (or 1414315 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 311145340 is about 17639.3123448733. The cubic root of 311145340 is about 677.6224203829.

Adding to 311145340 its reverse (43541113), we get a palindrome (354686453).

The spelling of 311145340 in words is "three hundred eleven million, one hundred forty-five thousand, three hundred forty".