143145689 has 2 divisors, whose sum is σ = 143145690. Its totient is φ = 143145688.

The previous prime is 143145643. The next prime is 143145733. The reversal of 143145689 is 986541341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123387664 + 19758025 = 11108^2 + 4445^2 .

It is an emirp because it is prime and its reverse (986541341) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143145689 is a prime.

It is not a weakly prime, because it can be changed into another prime (143145619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71572844 + 71572845.

It is an arithmetic number, because the mean of its divisors is an integer number (71572845).

Almost surely, 2^143145689 is an apocalyptic number.

It is an amenable number.

143145689 is a deficient number, since it is larger than the sum of its proper divisors (1).

143145689 is an equidigital number, since it uses as much as digits as its factorization.

143145689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 41.

The square root of 143145689 is about 11964.3507554735. The cubic root of 143145689 is about 523.1096813910.

The spelling of 143145689 in words is "one hundred forty-three million, one hundred forty-five thousand, six hundred eighty-nine".