989229811 has 2 divisors, whose sum is σ = 989229812. Its totient is φ = 989229810.

The previous prime is 989229767. The next prime is 989229833. The reversal of 989229811 is 118922989.

It is a strong prime.

It is an emirp because it is prime and its reverse (118922989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989229811 - 2²³ = 980841203 is a prime.

It is not a weakly prime, because it can be changed into another prime (989229511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494614905 + 494614906.

It is an arithmetic number, because the mean of its divisors is an integer number (494614906).

Almost surely, 2^989229811 is an apocalyptic number.

989229811 is a deficient number, since it is larger than the sum of its proper divisors (1).

989229811 is an equidigital number, since it uses as much as digits as its factorization.

989229811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 49.

The square root of 989229811 is about 31452.0239571319. The cubic root of 989229811 is about 996.3969707717.

The spelling of 989229811 in words is "nine hundred eighty-nine million, two hundred twenty-nine thousand, eight hundred eleven".