989525989 has 2 divisors, whose sum is σ = 989525990. Its totient is φ = 989525988.

The previous prime is 989525981. The next prime is 989526001.

989525989 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 759002500 + 230523489 = 27550^2 + 15183^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 989525989 - 2³ = 989525981 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 989525989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989525981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494762994 + 494762995.

It is an arithmetic number, because the mean of its divisors is an integer number (494762995).

Almost surely, 2^989525989 is an apocalyptic number.

It is an amenable number.

989525989 is a deficient number, since it is larger than the sum of its proper divisors (1).

989525989 is an equidigital number, since it uses as much as digits as its factorization.

989525989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20995200, while the sum is 64.

The square root of 989525989 is about 31456.7320139903. The cubic root of 989525989 is about 996.4964021378.

The spelling of 989525989 in words is "nine hundred eighty-nine million, five hundred twenty-five thousand, nine hundred eighty-nine".