989859811 has 2 divisors, whose sum is σ = 989859812. Its totient is φ = 989859810.

The previous prime is 989859769. The next prime is 989859817. The reversal of 989859811 is 118958989.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989859811 is a prime.

It is not a weakly prime, because it can be changed into another prime (989859817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494929905 + 494929906.

It is an arithmetic number, because the mean of its divisors is an integer number (494929906).

Almost surely, 2^989859811 is an apocalyptic number.

989859811 is a deficient number, since it is larger than the sum of its proper divisors (1).

989859811 is an equidigital number, since it uses as much as digits as its factorization.

989859811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 58.

The square root of 989859811 is about 31462.0376167851. The cubic root of 989859811 is about 996.6084473747.

The spelling of 989859811 in words is "nine hundred eighty-nine million, eight hundred fifty-nine thousand, eight hundred eleven".