985989143 has 2 divisors, whose sum is σ = 985989144. Its totient is φ = 985989142.

The previous prime is 985989127. The next prime is 985989149. The reversal of 985989143 is 341989589.

It is a strong prime.

It is an emirp because it is prime and its reverse (341989589) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 985989143 - 2⁴ = 985989127 is a prime.

It is a super-2 number, since 2×985989143² = 1944349180227748898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (985989149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492994571 + 492994572.

It is an arithmetic number, because the mean of its divisors is an integer number (492994572).

Almost surely, 2^985989143 is an apocalyptic number.

985989143 is a deficient number, since it is larger than the sum of its proper divisors (1).

985989143 is an equidigital number, since it uses as much as digits as its factorization.

985989143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 56.

The square root of 985989143 is about 31400.4640570804. The cubic root of 985989143 is about 995.3077313857.

The spelling of 985989143 in words is "nine hundred eighty-five million, nine hundred eighty-nine thousand, one hundred forty-three".