198643013 has 4 divisors (see below), whose sum is σ = 200093100. Its totient is φ = 197192928.

The previous prime is 198642979. The next prime is 198643031. The reversal of 198643013 is 310346891.

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 125933284 + 72709729 = 11222^2 + 8527^2 .

It is a cyclic number.

It is not a de Polignac number, because 198643013 - 2⁶ = 198642949 is a prime.

It is a super-2 number, since 2×198643013² = 78918093227436338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198642013) 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, 724838 + ... + 725111.

It is an arithmetic number, because the mean of its divisors is an integer number (50023275).

Almost surely, 2^198643013 is an apocalyptic number.

It is an amenable number.

198643013 is a deficient number, since it is larger than the sum of its proper divisors (1450087).

198643013 is a wasteful number, since it uses less digits than its factorization.

198643013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450086.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 198643013 is about 14094.0772312344. The cubic root of 198643013 is about 583.4779270040.

The spelling of 198643013 in words is "one hundred ninety-eight million, six hundred forty-three thousand, thirteen".