143405231 has 2 divisors, whose sum is σ = 143405232. Its totient is φ = 143405230.

The previous prime is 143405177. The next prime is 143405233. The reversal of 143405231 is 132504341.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 143405231 - 2¹⁰ = 143404207 is a prime.

It is a super-2 number, since 2×143405231² = 41130120556326722, which contains 22 as substring.

Together with 143405233, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 143405197 and 143405206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143405233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71702615 + 71702616.

It is an arithmetic number, because the mean of its divisors is an integer number (71702616).

Almost surely, 2^143405231 is an apocalyptic number.

143405231 is a deficient number, since it is larger than the sum of its proper divisors (1).

143405231 is an equidigital number, since it uses as much as digits as its factorization.

143405231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 143405231 is about 11975.1923157835. The cubic root of 143405231 is about 523.4256461045.

Adding to 143405231 its reverse (132504341), we get a palindrome (275909572).

The spelling of 143405231 in words is "one hundred forty-three million, four hundred five thousand, two hundred thirty-one".