1231331020 has 24 divisors (see below), whose sum is σ = 2614852800.
Its totient is φ = 486997632.
The previous prime is 1231330999. The next prime is 1231331027. The reversal of 1231331020 is 201331321.
Adding to 1231331020 its reverse (201331321), we get a palindrome (1432662341).
It is a junction number, because it is equal to n+sod(n) for n = 1231330985 and 1231331003.
It is not an unprimeable number, because it can be changed into a prime (1231331027) 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, 344100 + ... + 347659.
It is an arithmetic number, because the mean of its divisors is an integer number (108952200).
Almost surely, 21231331020 is an apocalyptic number.
1231331020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
1231331020 is an abundant number, since it is smaller than the sum of its proper divisors (1383521780).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1231331020 is a wasteful number, since it uses less digits than its factorization.
1231331020 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 691857 (or 691855 counting only the distinct ones).
The product of its (nonzero) digits is 108, while the sum is 16.
The square root of 1231331020 is about 35090.3265872519.
The cubic root of 1231331020 is about 1071.8276099769.
The spelling of 1231331020 in words is "one billion, two hundred thirty-one million, three hundred thirty-one thousand, twenty".