1231231542 has 8 divisors (see below), whose sum is σ = 2462463096. Its totient is φ = 410410512.

The previous prime is 1231231537. The next prime is 1231231543. The reversal of 1231231542 is 2451321321.

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

1231231542 is an admirable number.

It is a super-2 number, since 2×1231231542² = 3031862220031395528, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231231543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102602623 + ... + 102602634.

It is an arithmetic number, because the mean of its divisors is an integer number (307807887).

Almost surely, 2^1231231542 is an apocalyptic number.

1231231542 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1231231542 is a wasteful number, since it uses less digits than its factorization.

1231231542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205205262.

The product of its digits is 1440, while the sum is 24.

The square root of 1231231542 is about 35088.9091024500. The cubic root of 1231231542 is about 1071.7987452398.

Adding to 1231231542 its reverse (2451321321), we get a palindrome (3682552863).

It can be divided in two parts, 123 and 1231542, that added together give a triangular number (1231665 = T₁₅₆₉).

The spelling of 1231231542 in words is "one billion, two hundred thirty-one million, two hundred thirty-one thousand, five hundred forty-two".