198502181 has 2 divisors, whose sum is σ = 198502182. Its totient is φ = 198502180.

The previous prime is 198502169. The next prime is 198502211. The reversal of 198502181 is 181205891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169234081 + 29268100 = 13009^2 + 5410^2 .

It is a cyclic number.

It is not a de Polignac number, because 198502181 - 2¹⁸ = 198240037 is a prime.

It is a super-2 number, since 2×198502181² = 78806231723513522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198502141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99251090 + 99251091.

It is an arithmetic number, because the mean of its divisors is an integer number (99251091).

Almost surely, 2^198502181 is an apocalyptic number.

It is an amenable number.

198502181 is a deficient number, since it is larger than the sum of its proper divisors (1).

198502181 is an equidigital number, since it uses as much as digits as its factorization.

198502181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 35.

The square root of 198502181 is about 14089.0802041865. The cubic root of 198502181 is about 583.3400048942.

The spelling of 198502181 in words is "one hundred ninety-eight million, five hundred two thousand, one hundred eighty-one".