1231231530 has 32 divisors (see below), whose sum is σ = 2999064384. Its totient is φ = 323427456.

The previous prime is 1231231489. The next prime is 1231231531. The reversal of 1231231530 is 351321321.

It is a super-2 number, since 2×1231231530² = 3031862160932281800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1231231497 and 1231231506.

It is not an unprimeable number, because it can be changed into a prime (1231231531) 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, 304267 + ... + 308286.

It is an arithmetic number, because the mean of its divisors is an integer number (93720762).

Almost surely, 2^1231231530 is an apocalyptic number.

1231231530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1231231530 is an abundant number, since it is smaller than the sum of its proper divisors (1767832854).

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

1231231530 is a wasteful number, since it uses less digits than its factorization.

1231231530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612630.

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

The square root of 1231231530 is about 35088.9089314558. The cubic root of 1231231530 is about 1071.7987417578.

Adding to 1231231530 its reverse (351321321), we get a palindrome (1582552851).

The spelling of 1231231530 in words is "one billion, two hundred thirty-one million, two hundred thirty-one thousand, five hundred thirty".