998698423801 has 9 divisors (see below), whose sum is σ = 1081444905549. Its totient is φ = 921863475936.

The previous prime is 998698423771. The next prime is 998698423813. The reversal of 998698423801 is 108324896899.

The square root of 998698423801 is 999349.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 91899316201 + 906799107600 = 303149^2 + 952260^2 .

It is not a de Polignac number, because 998698423801 - 2³⁵ = 964338685433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998698423831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12953101 + ... + 13029973.

It is an arithmetic number, because the mean of its divisors is an integer number (120160545061).

Almost surely, 2^998698423801 is an apocalyptic number.

998698423801 is the 999349-th square number.

998698423801 is the 499675-th centered octagonal number.

It is an amenable number.

998698423801 is a deficient number, since it is larger than the sum of its proper divisors (82746481748).

998698423801 is an frugal number, since it uses more digits than its factorization.

998698423801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153772 (or 76886 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 67.

The spelling of 998698423801 in words is "nine hundred ninety-eight billion, six hundred ninety-eight million, four hundred twenty-three thousand, eight hundred one".