198487609 has 4 divisors (see below), whose sum is σ = 198913104. Its totient is φ = 198062116.

The previous prime is 198487603. The next prime is 198487643. The reversal of 198487609 is 906784891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 906784891 = 21193 ⋅42787.

It is a cyclic number.

It is not a de Polignac number, because 198487609 - 2⁷ = 198487481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198487603) 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, 212047 + ... + 212980.

It is an arithmetic number, because the mean of its divisors is an integer number (49728276).

Almost surely, 2^198487609 is an apocalyptic number.

It is an amenable number.

198487609 is a deficient number, since it is larger than the sum of its proper divisors (425495).

198487609 is an equidigital number, since it uses as much as digits as its factorization.

198487609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425494.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 198487609 is about 14088.5630566073. The cubic root of 198487609 is about 583.3257302592.

The spelling of 198487609 in words is "one hundred ninety-eight million, four hundred eighty-seven thousand, six hundred nine".