142811231 has 8 divisors (see below), whose sum is σ = 146918640. Its totient is φ = 138716928.

The previous prime is 142811197. The next prime is 142811233. The reversal of 142811231 is 132118241.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 142811231 - 2¹⁰ = 142810207 is a prime.

It is a super-2 number, since 2×142811231² = 40790095399470722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 142811197 and 142811206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142811233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21455 + ... + 27311.

It is an arithmetic number, because the mean of its divisors is an integer number (18364830).

Almost surely, 2^142811231 is an apocalyptic number.

142811231 is a deficient number, since it is larger than the sum of its proper divisors (4107409).

142811231 is an equidigital number, since it uses as much as digits as its factorization.

142811231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6553.

The product of its digits is 384, while the sum is 23.

The square root of 142811231 is about 11950.3653082238. The cubic root of 142811231 is about 522.7019507340.

Adding to 142811231 its reverse (132118241), we get a palindrome (274929472).

The spelling of 142811231 in words is "one hundred forty-two million, eight hundred eleven thousand, two hundred thirty-one".