198253561 has 4 divisors (see below), whose sum is σ = 216276624. Its totient is φ = 180230500.

The previous prime is 198253519. The next prime is 198253571. The reversal of 198253561 is 165352891.

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.

It is a cyclic number.

It is not a de Polignac number, because 198253561 - 2²³ = 189864953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198253501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9011515 + ... + 9011536.

It is an arithmetic number, because the mean of its divisors is an integer number (54069156).

Almost surely, 2^198253561 is an apocalyptic number.

198253561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

198253561 is a deficient number, since it is larger than the sum of its proper divisors (18023063).

198253561 is a wasteful number, since it uses less digits than its factorization.

198253561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18023062.

The product of its digits is 64800, while the sum is 40.

The square root of 198253561 is about 14080.2542945786. The cubic root of 198253561 is about 583.0963625952.

The spelling of 198253561 in words is "one hundred ninety-eight million, two hundred fifty-three thousand, five hundred sixty-one".