998195881 has 8 divisors (see below), whose sum is σ = 1023561000. Its totient is φ = 972879360.

The previous prime is 998195857. The next prime is 998195893. The reversal of 998195881 is 188591899.

998195881 = 22340² + 22341².

It can be written as a sum of positive squares in 4 ways, for example, as 209091600 + 789104281 = 14460^2 + 28091^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 998195881 - 2⁹ = 998195369 is a prime.

It is a super-2 number, since 2×998195881² = 1992790033690732322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998105881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31405 + ... + 54613.

It is an arithmetic number, because the mean of its divisors is an integer number (127945125).

Almost surely, 2^998195881 is an apocalyptic number.

998195881 is the 22341-st centered square number.

It is an amenable number.

998195881 is a deficient number, since it is larger than the sum of its proper divisors (25365119).

998195881 is a wasteful number, since it uses less digits than its factorization.

998195881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24299.

The product of its digits is 1866240, while the sum is 58.

The square root of 998195881 is about 31594.2380981090. The cubic root of 998195881 is about 999.3982649876.

The spelling of 998195881 in words is "nine hundred ninety-eight million, one hundred ninety-five thousand, eight hundred eighty-one".