143931881 has 2 divisors, whose sum is σ = 143931882. Its totient is φ = 143931880.

The previous prime is 143931869. The next prime is 143931883. The reversal of 143931881 is 188139341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121992025 + 21939856 = 11045^2 + 4684^2 .

It is a cyclic number.

It is not a de Polignac number, because 143931881 - 2⁶ = 143931817 is a prime.

It is a super-2 number, since 2×143931881² = 41432772736396322, which contains 22 as substring.

Together with 143931883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (143931883) 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, 71965940 + 71965941.

It is an arithmetic number, because the mean of its divisors is an integer number (71965941).

Almost surely, 2^143931881 is an apocalyptic number.

It is an amenable number.

143931881 is a deficient number, since it is larger than the sum of its proper divisors (1).

143931881 is an equidigital number, since it uses as much as digits as its factorization.

143931881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 38.

The square root of 143931881 is about 11997.1613725914. The cubic root of 143931881 is about 524.0656166009.

The spelling of 143931881 in words is "one hundred forty-three million, nine hundred thirty-one thousand, eight hundred eighty-one".