143256989 has 2 divisors, whose sum is σ = 143256990. Its totient is φ = 143256988.

The previous prime is 143256917. The next prime is 143257001. The reversal of 143256989 is 989652341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131492089 + 11764900 = 11467^2 + 3430^2 .

It is an emirp because it is prime and its reverse (989652341) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 143256989 - 2²⁰ = 142208413 is a prime.

It is a super-2 number, since 2×143256989² = 41045129794692242, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143256689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71628494 + 71628495.

It is an arithmetic number, because the mean of its divisors is an integer number (71628495).

Almost surely, 2^143256989 is an apocalyptic number.

It is an amenable number.

143256989 is a deficient number, since it is larger than the sum of its proper divisors (1).

143256989 is an equidigital number, since it uses as much as digits as its factorization.

143256989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 47.

The square root of 143256989 is about 11969.0011696883. The cubic root of 143256989 is about 523.2452240088.

The spelling of 143256989 in words is "one hundred forty-three million, two hundred fifty-six thousand, nine hundred eighty-nine".