198785537 has 4 divisors (see below), whose sum is σ = 199245060. Its totient is φ = 198326016.

The previous prime is 198785533. The next prime is 198785579. The reversal of 198785537 is 735587891.

It is a happy number.

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 50822641 + 147962896 = 7129^2 + 12164^2 .

It is a cyclic number.

It is not a de Polignac number, because 198785537 - 2² = 198785533 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198785533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229112 + ... + 229977.

It is an arithmetic number, because the mean of its divisors is an integer number (49811265).

Almost surely, 2^198785537 is an apocalyptic number.

It is an amenable number.

198785537 is a deficient number, since it is larger than the sum of its proper divisors (459523).

198785537 is an equidigital number, since it uses as much as digits as its factorization.

198785537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459522.

The product of its digits is 2116800, while the sum is 53.

The square root of 198785537 is about 14099.1324910436. The cubic root of 198785537 is about 583.6174398014.

The spelling of 198785537 in words is "one hundred ninety-eight million, seven hundred eighty-five thousand, five hundred thirty-seven".