143213131 has 4 divisors (see below), whose sum is σ = 143461912. Its totient is φ = 142964352.

The previous prime is 143213129. The next prime is 143213167. The reversal of 143213131 is 131312341.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 143213131 - 2¹ = 143213129 is a prime.

It is a super-3 number, since 3×143213131³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 143213099 and 143213108.

It is not an unprimeable number, because it can be changed into a prime (143213101) 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, 123525 + ... + 124678.

It is an arithmetic number, because the mean of its divisors is an integer number (35865478).

Almost surely, 2^143213131 is an apocalyptic number.

143213131 is a deficient number, since it is larger than the sum of its proper divisors (248781).

143213131 is an equidigital number, since it uses as much as digits as its factorization.

143213131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248780.

The product of its digits is 216, while the sum is 19.

The square root of 143213131 is about 11967.1688798980. The cubic root of 143213131 is about 523.1918215385.

Adding to 143213131 its reverse (131312341), we get a palindrome (274525472).

The spelling of 143213131 in words is "one hundred forty-three million, two hundred thirteen thousand, one hundred thirty-one".