989859961 has 2 divisors, whose sum is σ = 989859962. Its totient is φ = 989859960.

The previous prime is 989859931. The next prime is 989860031. The reversal of 989859961 is 169958989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 601769961 + 388090000 = 24531^2 + 19700^2 .

It is a cyclic number.

It is not a de Polignac number, because 989859961 - 2¹⁹ = 989335673 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 989859893 and 989859902.

It is not a weakly prime, because it can be changed into another prime (989859931) 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, 494929980 + 494929981.

It is an arithmetic number, because the mean of its divisors is an integer number (494929981).

Almost surely, 2^989859961 is an apocalyptic number.

It is an amenable number.

989859961 is a deficient number, since it is larger than the sum of its proper divisors (1).

989859961 is an equidigital number, since it uses as much as digits as its factorization.

989859961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12597120, while the sum is 64.

The square root of 989859961 is about 31462.0400006103. The cubic root of 989859961 is about 996.6084977156.

The spelling of 989859961 in words is "nine hundred eighty-nine million, eight hundred fifty-nine thousand, nine hundred sixty-one".