1231204143 has 8 divisors (see below), whose sum is σ = 1767882928. Its totient is φ = 757664064.

The previous prime is 1231204109. The next prime is 1231204147. The reversal of 1231204143 is 3414021321.

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

It is not a de Polignac number, because 1231204143 - 2⁸ = 1231203887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231204147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15784630 + ... + 15784707.

It is an arithmetic number, because the mean of its divisors is an integer number (220985366).

Almost surely, 2^1231204143 is an apocalyptic number.

1231204143 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1231204143 is a deficient number, since it is larger than the sum of its proper divisors (536678785).

1231204143 is a wasteful number, since it uses less digits than its factorization.

1231204143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31569353.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1231204143 is about 35088.5186777669. The cubic root of 1231204143 is about 1071.7907948176.

Adding to 1231204143 its reverse (3414021321), we get a palindrome (4645225464).

The spelling of 1231204143 in words is "one billion, two hundred thirty-one million, two hundred four thousand, one hundred forty-three".