989557 has 2 divisors, whose sum is σ = 989558. Its totient is φ = 989556.

The previous prime is 989533. The next prime is 989561. The reversal of 989557 is 755989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 988036 + 1521 = 994^2 + 39^2 .

It is a cyclic number.

It is not a de Polignac number, because 989557 - 2¹¹ = 987509 is a prime.

989557 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989507) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494778 + 494779.

It is an arithmetic number, because the mean of its divisors is an integer number (494779).

2⁹⁸⁹⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

989557 is a deficient number, since it is larger than the sum of its proper divisors (1).

989557 is an equidigital number, since it uses as much as digits as its factorization.

989557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113400, while the sum is 43.

The square root of 989557 is about 994.7647963212. The cubic root of 989557 is about 99.6506811845.

The spelling of 989557 in words is "nine hundred eighty-nine thousand, five hundred fifty-seven".