198968561 has 16 divisors (see below), whose sum is σ = 239822208. Its totient is φ = 162835200.

The previous prime is 198968543. The next prime is 198968579. The reversal of 198968561 is 165869891.

198968561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (198968543) and next prime (198968579).

It is not a de Polignac number, because 198968561 - 2²² = 194774257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198968521) 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, 18830 + ... + 27431.

It is an arithmetic number, because the mean of its divisors is an integer number (14988888).

Almost surely, 2^198968561 is an apocalyptic number.

198968561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

198968561 is a deficient number, since it is larger than the sum of its proper divisors (40853647).

198968561 is a wasteful number, since it uses less digits than its factorization.

198968561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46312.

The product of its digits is 933120, while the sum is 53.

The square root of 198968561 is about 14105.6216098405. The cubic root of 198968561 is about 583.7964991610.

The spelling of 198968561 in words is "one hundred ninety-eight million, nine hundred sixty-eight thousand, five hundred sixty-one".