811231340 has 24 divisors (see below), whose sum is σ = 1704121440. Its totient is φ = 324390528.

The previous prime is 811231339. The next prime is 811231387. The reversal of 811231340 is 43132118.

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 7 ways as a sum of consecutive naturals, for example, 118121 + ... + 124799.

It is an arithmetic number, because the mean of its divisors is an integer number (71005060).

Almost surely, 2^811231340 is an apocalyptic number.

It is an amenable number.

811231340 is an abundant number, since it is smaller than the sum of its proper divisors (892890100).

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

811231340 is a wasteful number, since it uses less digits than its factorization.

811231340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12761 (or 12759 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 811231340 is about 28482.1231652417. The cubic root of 811231340 is about 932.6418656815.

Adding to 811231340 its reverse (43132118), we get a palindrome (854363458).

The spelling of 811231340 in words is "eight hundred eleven million, two hundred thirty-one thousand, three hundred forty".