998825857 has 2 divisors, whose sum is σ = 998825858. Its totient is φ = 998825856.

The previous prime is 998825827. The next prime is 998825873. The reversal of 998825857 is 758528899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 551122576 + 447703281 = 23476^2 + 21159^2 .

It is a cyclic number.

It is not a de Polignac number, because 998825857 - 2¹¹ = 998823809 is a prime.

It is a super-2 number, since 2×998825857² = 1995306185223568898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 998825795 and 998825804.

It is not a weakly prime, because it can be changed into another prime (998825827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499412928 + 499412929.

It is an arithmetic number, because the mean of its divisors is an integer number (499412929).

Almost surely, 2^998825857 is an apocalyptic number.

It is an amenable number.

998825857 is a deficient number, since it is larger than the sum of its proper divisors (1).

998825857 is an equidigital number, since it uses as much as digits as its factorization.

998825857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14515200, while the sum is 61.

The square root of 998825857 is about 31604.2063181470. The cubic root of 998825857 is about 999.6084657209.

The spelling of 998825857 in words is "nine hundred ninety-eight million, eight hundred twenty-five thousand, eight hundred fifty-seven".