998138177 has 4 divisors (see below), whose sum is σ = 1000443780. Its totient is φ = 995832576.

The previous prime is 998138171. The next prime is 998138203. The reversal of 998138177 is 771831899.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33166081 + 964972096 = 5759^2 + 31064^2 .

It is a cyclic number.

It is not a de Polignac number, because 998138177 - 2¹⁴ = 998121793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998138171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1152152 + ... + 1153017.

It is an arithmetic number, because the mean of its divisors is an integer number (250110945).

Almost surely, 2^998138177 is an apocalyptic number.

It is an amenable number.

998138177 is a deficient number, since it is larger than the sum of its proper divisors (2305603).

998138177 is a wasteful number, since it uses less digits than its factorization.

998138177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2305602.

The product of its digits is 762048, while the sum is 53.

The square root of 998138177 is about 31593.3248804237. The cubic root of 998138177 is about 999.3790067806.

The spelling of 998138177 in words is "nine hundred ninety-eight million, one hundred thirty-eight thousand, one hundred seventy-seven".