989896819 has 2 divisors, whose sum is σ = 989896820. Its totient is φ = 989896818.

The previous prime is 989896813. The next prime is 989896823. The reversal of 989896819 is 918698989.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 989896819 - 2³ = 989896811 is a prime.

It is a super-2 number, since 2×989896819² = 1959791424532637522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (989896811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494948409 + 494948410.

It is an arithmetic number, because the mean of its divisors is an integer number (494948410).

Almost surely, 2^989896819 is an apocalyptic number.

989896819 is a deficient number, since it is larger than the sum of its proper divisors (1).

989896819 is an equidigital number, since it uses as much as digits as its factorization.

989896819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20155392, while the sum is 67.

The square root of 989896819 is about 31462.6257486561. The cubic root of 989896819 is about 996.6208673239.

The spelling of 989896819 in words is "nine hundred eighty-nine million, eight hundred ninety-six thousand, eight hundred nineteen".