143231013 has 6 divisors (see below), whose sum is σ = 206889254. Its totient is φ = 95487336.

The previous prime is 143231009. The next prime is 143231047. The reversal of 143231013 is 310132341.

It can be written as a sum of positive squares in only one way, i.e., 137311524 + 5919489 = 11718^2 + 2433^2 .

It is not a de Polignac number, because 143231013 - 2² = 143231009 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143231093) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7957270 + ... + 7957287.

Almost surely, 2^143231013 is an apocalyptic number.

It is an amenable number.

143231013 is a deficient number, since it is larger than the sum of its proper divisors (63658241).

143231013 is a wasteful number, since it uses less digits than its factorization.

143231013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15914563 (or 15914560 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 143231013 is about 11967.9159839965. The cubic root of 143231013 is about 523.2135963732.

Adding to 143231013 its reverse (310132341), we get a palindrome (453363354).

The spelling of 143231013 in words is "one hundred forty-three million, two hundred thirty-one thousand, thirteen".