981789329 has 2 divisors, whose sum is σ = 981789330. Its totient is φ = 981789328.

The previous prime is 981789317. The next prime is 981789371. The reversal of 981789329 is 923987189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 908721025 + 73068304 = 30145^2 + 8548^2 .

It is an emirp because it is prime and its reverse (923987189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 981789329 - 2⁸ = 981789073 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (981789379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490894664 + 490894665.

It is an arithmetic number, because the mean of its divisors is an integer number (490894665).

Almost surely, 2^981789329 is an apocalyptic number.

It is an amenable number.

981789329 is a deficient number, since it is larger than the sum of its proper divisors (1).

981789329 is an equidigital number, since it uses as much as digits as its factorization.

981789329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 56.

The square root of 981789329 is about 31333.5176608053. The cubic root of 981789329 is about 993.8925513421.

The spelling of 981789329 in words is "nine hundred eighty-one million, seven hundred eighty-nine thousand, three hundred twenty-nine".