198530077 has 4 divisors (see below), whose sum is σ = 203372316. Its totient is φ = 193687840.

The previous prime is 198530071. The next prime is 198530117. The reversal of 198530077 is 770035891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 770035891 = 67 ⋅11493073.

It can be written as a sum of positive squares in 2 ways, for example, as 105966436 + 92563641 = 10294^2 + 9621^2 .

It is a cyclic number.

It is not a de Polignac number, because 198530077 - 2⁷ = 198529949 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198530071) 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, 2421058 + ... + 2421139.

It is an arithmetic number, because the mean of its divisors is an integer number (50843079).

Almost surely, 2^198530077 is an apocalyptic number.

It is an amenable number.

198530077 is a deficient number, since it is larger than the sum of its proper divisors (4842239).

198530077 is an equidigital number, since it uses as much as digits as its factorization.

198530077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4842238.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 198530077 is about 14090.0701559644. The cubic root of 198530077 is about 583.3673296831.

The spelling of 198530077 in words is "one hundred ninety-eight million, five hundred thirty thousand, seventy-seven".