198610505 has 4 divisors (see below), whose sum is σ = 238332612. Its totient is φ = 158888400.

The previous prime is 198610493. The next prime is 198610513. The reversal of 198610505 is 505016891.

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 54346384 + 144264121 = 7372^2 + 12011^2 .

It is not a de Polignac number, because 198610505 - 2¹² = 198606409 is a prime.

It is a super-2 number, since 2×198610505² = 78892265392710050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19861046 + ... + 19861055.

It is an arithmetic number, because the mean of its divisors is an integer number (59583153).

Almost surely, 2^198610505 is an apocalyptic number.

It is an amenable number.

198610505 is a deficient number, since it is larger than the sum of its proper divisors (39722107).

198610505 is an equidigital number, since it uses as much as digits as its factorization.

198610505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39722106.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 198610505 is about 14092.9239336626. The cubic root of 198610505 is about 583.4460964772.

The spelling of 198610505 in words is "one hundred ninety-eight million, six hundred ten thousand, five hundred five".