198880061 has 2 divisors, whose sum is σ = 198880062. Its totient is φ = 198880060.

The previous prime is 198880037. The next prime is 198880079. The reversal of 198880061 is 160088891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187279225 + 11600836 = 13685^2 + 3406^2 .

It is a cyclic number.

It is not a de Polignac number, because 198880061 - 2¹⁸ = 198617917 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198880861) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99440030 + 99440031.

It is an arithmetic number, because the mean of its divisors is an integer number (99440031).

Almost surely, 2^198880061 is an apocalyptic number.

It is an amenable number.

198880061 is a deficient number, since it is larger than the sum of its proper divisors (1).

198880061 is an equidigital number, since it uses as much as digits as its factorization.

198880061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 198880061 is about 14102.4842137830. The cubic root of 198880061 is about 583.7099299529.

The spelling of 198880061 in words is "one hundred ninety-eight million, eight hundred eighty thousand, sixty-one".