989561 has 2 divisors, whose sum is σ = 989562. Its totient is φ = 989560.

The previous prime is 989557. The next prime is 989579. The reversal of 989561 is 165989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 913936 + 75625 = 956^2 + 275^2 .

It is a cyclic number.

It is not a de Polignac number, because 989561 - 2² = 989557 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (989581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494780 + 494781.

It is an arithmetic number, because the mean of its divisors is an integer number (494781).

2⁹⁸⁹⁵⁶¹ is an apocalyptic number.

It is an amenable number.

989561 is a deficient number, since it is larger than the sum of its proper divisors (1).

989561 is an equidigital number, since it uses as much as digits as its factorization.

989561 is an evil number, because the sum of its binary digits is even.

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

The square root of 989561 is about 994.7668068447. The cubic root of 989561 is about 99.6508154541.

Adding to 989561 its product of digits (19440), we get a palindrome (1009001).

The spelling of 989561 in words is "nine hundred eighty-nine thousand, five hundred sixty-one".