198810557 has 4 divisors (see below), whose sum is σ = 216884256. Its totient is φ = 180736860.

The previous prime is 198810541. The next prime is 198810559. The reversal of 198810557 is 755018891.

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.

It is a cyclic number.

It is not a de Polignac number, because 198810557 - 2⁴ = 198810541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198810559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9036833 + ... + 9036854.

It is an arithmetic number, because the mean of its divisors is an integer number (54221064).

Almost surely, 2^198810557 is an apocalyptic number.

It is an amenable number.

198810557 is a deficient number, since it is larger than the sum of its proper divisors (18073699).

198810557 is a wasteful number, since it uses less digits than its factorization.

198810557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18073698.

The product of its (nonzero) digits is 100800, while the sum is 44.

The square root of 198810557 is about 14100.0197517592. The cubic root of 198810557 is about 583.6419243053.

The spelling of 198810557 in words is "one hundred ninety-eight million, eight hundred ten thousand, five hundred fifty-seven".