989143511 has 2 divisors, whose sum is σ = 989143512. Its totient is φ = 989143510.

The previous prime is 989143481. The next prime is 989143517. The reversal of 989143511 is 115341989.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 989143511 - 2⁶ = 989143447 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989143517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494571755 + 494571756.

It is an arithmetic number, because the mean of its divisors is an integer number (494571756).

Almost surely, 2^989143511 is an apocalyptic number.

989143511 is a deficient number, since it is larger than the sum of its proper divisors (1).

989143511 is an equidigital number, since it uses as much as digits as its factorization.

989143511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 41.

The square root of 989143511 is about 31450.6519964213. The cubic root of 989143511 is about 996.3679948424.

The spelling of 989143511 in words is "nine hundred eighty-nine million, one hundred forty-three thousand, five hundred eleven".