989896849 has 2 divisors, whose sum is σ = 989896850. Its totient is φ = 989896848.

The previous prime is 989896841. The next prime is 989896861. The reversal of 989896849 is 948698989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 988473600 + 1423249 = 31440^2 + 1193^2 .

It is a cyclic number.

It is not a de Polignac number, because 989896849 - 2³ = 989896841 is a prime.

It is not a weakly prime, because it can be changed into another prime (989896841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494948424 + 494948425.

It is an arithmetic number, because the mean of its divisors is an integer number (494948425).

Almost surely, 2^989896849 is an apocalyptic number.

It is an amenable number.

989896849 is a deficient number, since it is larger than the sum of its proper divisors (1).

989896849 is an equidigital number, since it uses as much as digits as its factorization.

989896849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80621568, while the sum is 70.

The square root of 989896849 is about 31462.6262254123. The cubic root of 989896849 is about 996.6208773919.

The spelling of 989896849 in words is "nine hundred eighty-nine million, eight hundred ninety-six thousand, eight hundred forty-nine".