989595989 has 2 divisors, whose sum is σ = 989595990. Its totient is φ = 989595988.

The previous prime is 989595979. The next prime is 989596001.

989595989 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., 988033489 + 1562500 = 31433^2 + 1250^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 989595989 - 2¹⁶ = 989530453 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989595979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494797994 + 494797995.

It is an arithmetic number, because the mean of its divisors is an integer number (494797995).

Almost surely, 2^989595989 is an apocalyptic number.

It is an amenable number.

989595989 is a deficient number, since it is larger than the sum of its proper divisors (1).

989595989 is an equidigital number, since it uses as much as digits as its factorization.

989595989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94478400, while the sum is 71.

The square root of 989595989 is about 31457.8446337317. The cubic root of 989595989 is about 996.5198992816.

The spelling of 989595989 in words is "nine hundred eighty-nine million, five hundred ninety-five thousand, nine hundred eighty-nine".