198643613 has 16 divisors (see below), whose sum is σ = 239406720. Its totient is φ = 161009856.

The previous prime is 198643609. The next prime is 198643631. The reversal of 198643613 is 316346891.

It is not a de Polignac number, because 198643613 - 2² = 198643609 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198643673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99695 + ... + 101667.

It is an arithmetic number, because the mean of its divisors is an integer number (14962920).

Almost surely, 2^198643613 is an apocalyptic number.

It is an amenable number.

198643613 is a deficient number, since it is larger than the sum of its proper divisors (40763107).

198643613 is a wasteful number, since it uses less digits than its factorization.

198643613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2756.

The product of its digits is 93312, while the sum is 41.

The square root of 198643613 is about 14094.0985167552. The cubic root of 198643613 is about 583.4785144672.

The spelling of 198643613 in words is "one hundred ninety-eight million, six hundred forty-three thousand, six hundred thirteen".