143431231 has 4 divisors (see below), whose sum is σ = 144174592. Its totient is φ = 142687872.

The previous prime is 143431229. The next prime is 143431271. The reversal of 143431231 is 132134341.

143431231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132134341 = 19 ⋅6954439.

It is a cyclic number.

It is not a de Polignac number, because 143431231 - 2¹ = 143431229 is a prime.

It is a super-2 number, since 2×143431231² = 41145036052350722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143431201) 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, 371391 + ... + 371776.

It is an arithmetic number, because the mean of its divisors is an integer number (36043648).

Almost surely, 2^143431231 is an apocalyptic number.

143431231 is a deficient number, since it is larger than the sum of its proper divisors (743361).

143431231 is an equidigital number, since it uses as much as digits as its factorization.

143431231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743360.

The product of its digits is 864, while the sum is 22.

The square root of 143431231 is about 11976.2778441384. The cubic root of 143431231 is about 523.4572773179.

Adding to 143431231 its reverse (132134341), we get a palindrome (275565572).

The spelling of 143431231 in words is "one hundred forty-three million, four hundred thirty-one thousand, two hundred thirty-one".