198997045 has 16 divisors (see below), whose sum is σ = 257492592. Its totient is φ = 146764800.

The previous prime is 198997037. The next prime is 198997061. The reversal of 198997045 is 540799891.

It can be written as a sum of positive squares in 8 ways, for example, as 1004004 + 197993041 = 1002^2 + 14071^2 .

It is not a de Polignac number, because 198997045 - 2³ = 198997037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198996983 and 198997001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69645 + ... + 72445.

It is an arithmetic number, because the mean of its divisors is an integer number (16093287).

Almost surely, 2^198997045 is an apocalyptic number.

It is an amenable number.

198997045 is a deficient number, since it is larger than the sum of its proper divisors (58495547).

198997045 is a wasteful number, since it uses less digits than its factorization.

198997045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3912.

The product of its (nonzero) digits is 816480, while the sum is 52.

The square root of 198997045 is about 14106.6312420790. The cubic root of 198997045 is about 583.8243562689.

The spelling of 198997045 in words is "one hundred ninety-eight million, nine hundred ninety-seven thousand, forty-five".