143213531 has 2 divisors, whose sum is σ = 143213532. Its totient is φ = 143213530.

The previous prime is 143213503. The next prime is 143213557. The reversal of 143213531 is 135312341.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 143213531 - 2¹⁴ = 143197147 is a prime.

It is a super-2 number, since 2×143213531² = 41020230922975922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 143213497 and 143213506.

It is not a weakly prime, because it can be changed into another prime (143213501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71606765 + 71606766.

It is an arithmetic number, because the mean of its divisors is an integer number (71606766).

Almost surely, 2^143213531 is an apocalyptic number.

143213531 is a deficient number, since it is larger than the sum of its proper divisors (1).

143213531 is an equidigital number, since it uses as much as digits as its factorization.

143213531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 23.

The square root of 143213531 is about 11967.1855922769. The cubic root of 143213531 is about 523.1923086366.

Adding to 143213531 its reverse (135312341), we get a palindrome (278525872).

The spelling of 143213531 in words is "one hundred forty-three million, two hundred thirteen thousand, five hundred thirty-one".