981882689 has 2 divisors, whose sum is σ = 981882690. Its totient is φ = 981882688.

The previous prime is 981882607. The next prime is 981882701. The reversal of 981882689 is 986288189.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 963047089 + 18835600 = 31033^2 + 4340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981882689 is a prime.

It is a super-2 number, since 2×981882689² = 1928187229915741442, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (981882089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490941344 + 490941345.

It is an arithmetic number, because the mean of its divisors is an integer number (490941345).

Almost surely, 2^981882689 is an apocalyptic number.

It is an amenable number.

981882689 is a deficient number, since it is larger than the sum of its proper divisors (1).

981882689 is an equidigital number, since it uses as much as digits as its factorization.

981882689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3981312, while the sum is 59.

The square root of 981882689 is about 31335.0074038606. The cubic root of 981882689 is about 993.9240539821.

The spelling of 981882689 in words is "nine hundred eighty-one million, eight hundred eighty-two thousand, six hundred eighty-nine".