981406589 has 2 divisors, whose sum is σ = 981406590. Its totient is φ = 981406588.

The previous prime is 981406541. The next prime is 981406607. The reversal of 981406589 is 985604189.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 612958564 + 368448025 = 24758^2 + 19195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981406589 is a prime.

It is a super-2 number, since 2×981406589² = 1926317785865229842, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981406519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490703294 + 490703295.

It is an arithmetic number, because the mean of its divisors is an integer number (490703295).

Almost surely, 2^981406589 is an apocalyptic number.

It is an amenable number.

981406589 is a deficient number, since it is larger than the sum of its proper divisors (1).

981406589 is an equidigital number, since it uses as much as digits as its factorization.

981406589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 50.

The square root of 981406589 is about 31327.4095481896. The cubic root of 981406589 is about 993.7633817852.

The spelling of 981406589 in words is "nine hundred eighty-one million, four hundred six thousand, five hundred eighty-nine".