998885869 has 2 divisors, whose sum is σ = 998885870. Its totient is φ = 998885868.

The previous prime is 998885819. The next prime is 998885887. The reversal of 998885869 is 968588899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 923369769 + 75516100 = 30387^2 + 8690^2 .

It is a cyclic number.

It is not a de Polignac number, because 998885869 - 2⁹ = 998885357 is a prime.

It is a super-2 number, since 2×998885869² = 1995545958575770322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 998885798 and 998885807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998885809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499442934 + 499442935.

It is an arithmetic number, because the mean of its divisors is an integer number (499442935).

Almost surely, 2^998885869 is an apocalyptic number.

It is an amenable number.

998885869 is a deficient number, since it is larger than the sum of its proper divisors (1).

998885869 is an equidigital number, since it uses as much as digits as its factorization.

998885869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 89579520, while the sum is 70.

The square root of 998885869 is about 31605.1557344684. The cubic root of 998885869 is about 999.6284849937.

The spelling of 998885869 in words is "nine hundred ninety-eight million, eight hundred eighty-five thousand, eight hundred sixty-nine".