898961559809 has 2 divisors, whose sum is σ = 898961559810. Its totient is φ = 898961559808.

The previous prime is 898961559709. The next prime is 898961559857. The reversal of 898961559809 is 908955169898.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 716440359184 + 182521200625 = 846428^2 + 427225^2 .

It is a cyclic number.

It is not a de Polignac number, because 898961559809 - 2²⁸ = 898693124353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 898961559809.

It is not a weakly prime, because it can be changed into another prime (898961559889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449480779904 + 449480779905.

It is an arithmetic number, because the mean of its divisors is an integer number (449480779905).

Almost surely, 2^898961559809 is an apocalyptic number.

It is an amenable number.

898961559809 is a deficient number, since it is larger than the sum of its proper divisors (1).

898961559809 is an equidigital number, since it uses as much as digits as its factorization.

898961559809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 503884800, while the sum is 77.

The spelling of 898961559809 in words is "eight hundred ninety-eight billion, nine hundred sixty-one million, five hundred fifty-nine thousand, eight hundred nine".