898452817921 has 4 divisors (see below), whose sum is σ = 898648265812.
Its totient is φ = 898257370032.
The previous prime is 898452817877. The next prime is 898452817939. The reversal of 898452817921 is 129718254898.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 22897742400 + 875555075521 = 151320^2 + 935711^2
It is a cyclic number.
It is not a de Polignac number, because 898452817921 - 217 = 898452686849 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (898452817621) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97717050 + ... + 97726243.
It is an arithmetic number, because the mean of its divisors is an integer number (224662066453).
Almost surely, 2898452817921 is an apocalyptic number.
It is an amenable number.
898452817921 is a deficient number, since it is larger than the sum of its proper divisors (195447891).
898452817921 is a wasteful number, since it uses less digits than its factorization.
898452817921 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 195447890.
The product of its digits is 23224320, while the sum is 64.
The spelling of 898452817921 in words is "eight hundred ninety-eight billion, four hundred fifty-two million, eight hundred seventeen thousand, nine hundred twenty-one".