2017198081 has 4 divisors (see below), whose sum is σ = 2050266964. Its totient is φ = 1984129200.

The previous prime is 2017198063. The next prime is 2017198091. The reversal of 2017198081 is 1808917102.

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 256640400 + 1760557681 = 16020^2 + 41959^2 .

It is a cyclic number.

It is not a de Polignac number, because 2017198081 - 2⁹ = 2017197569 is a prime.

It is a super-2 number, since 2×2017198081² = 8138176195980165122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2017198081.

It is not an unprimeable number, because it can be changed into a prime (2017198091) 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, 16534350 + ... + 16534471.

It is an arithmetic number, because the mean of its divisors is an integer number (512566741).

It is a Proth number, since it is equal to 7695 ⋅ 2¹⁸ + 1 and 7695 < 2¹⁸.

Almost surely, 2^2017198081 is an apocalyptic number.

It is an amenable number.

2017198081 is a deficient number, since it is larger than the sum of its proper divisors (33068883).

2017198081 is an equidigital number, since it uses as much as digits as its factorization.

2017198081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33068882.

The product of its (nonzero) digits is 8064, while the sum is 37.

The square root of 2017198081 is about 44913.2283520123. The cubic root of 2017198081 is about 1263.5221183351.

The spelling of 2017198081 in words is "two billion, seventeen million, one hundred ninety-eight thousand, eighty-one".