998604181 has 2 divisors, whose sum is σ = 998604182. Its totient is φ = 998604180.

The previous prime is 998604169. The next prime is 998604203. The reversal of 998604181 is 181406899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 595799281 + 402804900 = 24409^2 + 20070^2 .

It is an emirp because it is prime and its reverse (181406899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 998604181 - 2⁵ = 998604149 is a prime.

It is a super-2 number, since 2×998604181² = 1994420620621361522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998604121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499302090 + 499302091.

It is an arithmetic number, because the mean of its divisors is an integer number (499302091).

Almost surely, 2^998604181 is an apocalyptic number.

It is an amenable number.

998604181 is a deficient number, since it is larger than the sum of its proper divisors (1).

998604181 is an equidigital number, since it uses as much as digits as its factorization.

998604181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 998604181 is about 31600.6990587234. The cubic root of 998604181 is about 999.5345103530.

The spelling of 998604181 in words is "nine hundred ninety-eight million, six hundred four thousand, one hundred eighty-one".