143211431 has 4 divisors (see below), whose sum is σ = 156230664. Its totient is φ = 130192200.

The previous prime is 143211421. The next prime is 143211463. The reversal of 143211431 is 134112341.

143211431 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: 134112341 = 11 ⋅12192031.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143211431 is a prime.

It is a super-2 number, since 2×143211431² = 41019027938135522, 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 (143211421) 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, 6509600 + ... + 6509621.

It is an arithmetic number, because the mean of its divisors is an integer number (39057666).

Almost surely, 2^143211431 is an apocalyptic number.

143211431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

143211431 is a deficient number, since it is larger than the sum of its proper divisors (13019233).

143211431 is a wasteful number, since it uses less digits than its factorization.

143211431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13019232.

The product of its digits is 288, while the sum is 20.

The square root of 143211431 is about 11967.0978520274. The cubic root of 143211431 is about 523.1897513614.

Adding to 143211431 its reverse (134112341), we get a palindrome (277323772).

The spelling of 143211431 in words is "one hundred forty-three million, two hundred eleven thousand, four hundred thirty-one".