1231530134020 has 48 divisors (see below), whose sum is σ = 2738828112048. Its totient is φ = 463552819200.

The previous prime is 1231530133997. The next prime is 1231530134069. The reversal of 1231530134020 is 204310351321.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 447635931136 + 783894202884 = 669056^2 + 885378^2 .

It is a super-2 number, since 2×1231530134020² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1620664 + ... + 2256016.

It is an arithmetic number, because the mean of its divisors is an integer number (57058919001).

Almost surely, 2^{1231530134020} is an apocalyptic number.

1231530134020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231530134020 is an abundant number, since it is smaller than the sum of its proper divisors (1507297978028).

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

1231530134020 is a wasteful number, since it uses less digits than its factorization.

1231530134020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641080 (or 641078 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 1231530134020 its reverse (204310351321), we get a palindrome (1435840485341).

The spelling of 1231530134020 in words is "one trillion, two hundred thirty-one billion, five hundred thirty million, one hundred thirty-four thousand, twenty".