981569 has 2 divisors, whose sum is σ = 981570. Its totient is φ = 981568.

The previous prime is 981527. The next prime is 981577. The reversal of 981569 is 965189.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 883600 + 97969 = 940^2 + 313^2 .

It is an emirp because it is prime and its reverse (965189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 981569 - 2¹⁶ = 916033 is a prime.

It is a super-2 number, since 2×981569² = 1926955403522, 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 (981599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490784 + 490785.

It is an arithmetic number, because the mean of its divisors is an integer number (490785).

2⁹⁸¹⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

981569 is a deficient number, since it is larger than the sum of its proper divisors (1).

981569 is an equidigital number, since it uses as much as digits as its factorization.

981569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 38.

The square root of 981569 is about 990.7416413980. The cubic root of 981569 is about 99.3818197395.

The spelling of 981569 in words is "nine hundred eighty-one thousand, five hundred sixty-nine".