998580101 has 2 divisors, whose sum is σ = 998580102. Its totient is φ = 998580100.

The previous prime is 998580097. The next prime is 998580103. The reversal of 998580101 is 101085899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 921122500 + 77457601 = 30350^2 + 8801^2 .

It is an emirp because it is prime and its reverse (101085899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 998580101 - 2² = 998580097 is a prime.

It is a super-2 number, since 2×998580101² = 1994324436226340402, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 998580103, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is equal to p_50779229 and since 998580101 and 50779229 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998580103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499290050 + 499290051.

It is an arithmetic number, because the mean of its divisors is an integer number (499290051).

Almost surely, 2^998580101 is an apocalyptic number.

It is an amenable number.

998580101 is a deficient number, since it is larger than the sum of its proper divisors (1).

998580101 is an equidigital number, since it uses as much as digits as its factorization.

998580101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 41.

The square root of 998580101 is about 31600.3180521969. The cubic root of 998580101 is about 999.5264761439.

The spelling of 998580101 in words is "nine hundred ninety-eight million, five hundred eighty thousand, one hundred one".