1231530542 has 8 divisors (see below), whose sum is σ = 2015231832. Its totient is φ = 559786600.

The previous prime is 1231530539. The next prime is 1231530577. The reversal of 1231530542 is 2450351321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27989309 + ... + 27989352.

It is an arithmetic number, because the mean of its divisors is an integer number (251903979).

Almost surely, 2^1231530542 is an apocalyptic number.

1231530542 is a deficient number, since it is larger than the sum of its proper divisors (783701290).

1231530542 is a wasteful number, since it uses less digits than its factorization.

1231530542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55978674.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 1231530542 is about 35093.1694493387. The cubic root of 1231530542 is about 1071.8854989970.

Adding to 1231530542 its reverse (2450351321), we get a palindrome (3681881863).

The spelling of 1231530542 in words is "one billion, two hundred thirty-one million, five hundred thirty thousand, five hundred forty-two".