898211661 has 4 divisors (see below), whose sum is σ = 1197615552. Its totient is φ = 598807772.

The previous prime is 898211653. The next prime is 898211669. The reversal of 898211661 is 166112898.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (898211653) and next prime (898211669).

It is a cyclic number.

It is not a de Polignac number, because 898211661 - 2³ = 898211653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (898211669) 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, 149701941 + ... + 149701946.

It is an arithmetic number, because the mean of its divisors is an integer number (299403888).

Almost surely, 2^898211661 is an apocalyptic number.

It is an amenable number.

898211661 is a deficient number, since it is larger than the sum of its proper divisors (299403891).

898211661 is a wasteful number, since it uses less digits than its factorization.

898211661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299403890.

The product of its digits is 41472, while the sum is 42.

The square root of 898211661 is about 29970.1795289918. The cubic root of 898211661 is about 964.8494708245.

The spelling of 898211661 in words is "eight hundred ninety-eight million, two hundred eleven thousand, six hundred sixty-one".