198536531 has 2 divisors, whose sum is σ = 198536532. Its totient is φ = 198536530.

The previous prime is 198536521. The next prime is 198536537. The reversal of 198536531 is 135635891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198536531 is a prime.

It is a super-2 number, since 2×198536531² = 78833508283027922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198536537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99268265 + 99268266.

It is an arithmetic number, because the mean of its divisors is an integer number (99268266).

Almost surely, 2^198536531 is an apocalyptic number.

198536531 is a deficient number, since it is larger than the sum of its proper divisors (1).

198536531 is an equidigital number, since it uses as much as digits as its factorization.

198536531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 41.

The square root of 198536531 is about 14090.2991806420. The cubic root of 198536531 is about 583.3736511634.

The spelling of 198536531 in words is "one hundred ninety-eight million, five hundred thirty-six thousand, five hundred thirty-one".