981644819 has 2 divisors, whose sum is σ = 981644820. Its totient is φ = 981644818.

The previous prime is 981644803. The next prime is 981644869. The reversal of 981644819 is 918446189.

It is an a-pointer prime, because the next prime (981644869) can be obtained adding 981644819 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 981644819 - 2⁴ = 981644803 is a prime.

It is a super-2 number, since 2×981644819² = 1927253101339085522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (981644869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490822409 + 490822410.

It is an arithmetic number, because the mean of its divisors is an integer number (490822410).

Almost surely, 2^981644819 is an apocalyptic number.

981644819 is a deficient number, since it is larger than the sum of its proper divisors (1).

981644819 is an equidigital number, since it uses as much as digits as its factorization.

981644819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 50.

The square root of 981644819 is about 31331.2115788713. The cubic root of 981644819 is about 993.8437851231.

The spelling of 981644819 in words is "nine hundred eighty-one million, six hundred forty-four thousand, eight hundred nineteen".