142313231 has 2 divisors, whose sum is σ = 142313232. Its totient is φ = 142313230.

The previous prime is 142313221. The next prime is 142313233. The reversal of 142313231 is 132313241.

It is a strong prime.

It is an emirp because it is prime and its reverse (132313241) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-142313231 is a prime.

It is a super-3 number, since 3×142313231³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 142313233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142313233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71156615 + 71156616.

It is an arithmetic number, because the mean of its divisors is an integer number (71156616).

Almost surely, 2^142313231 is an apocalyptic number.

142313231 is a deficient number, since it is larger than the sum of its proper divisors (1).

142313231 is an equidigital number, since it uses as much as digits as its factorization.

142313231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 20.

The square root of 142313231 is about 11929.5109287850. The cubic root of 142313231 is about 522.0936682026.

Adding to 142313231 its reverse (132313241), we get a palindrome (274626472).

The spelling of 142313231 in words is "one hundred forty-two million, three hundred thirteen thousand, two hundred thirty-one".