198503531 has 2 divisors, whose sum is σ = 198503532. Its totient is φ = 198503530.

The previous prime is 198503527. The next prime is 198503533. The reversal of 198503531 is 135305891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 198503531 - 2² = 198503527 is a prime.

It is a super-2 number, since 2×198503531² = 78807303638935922, which contains 22 as substring.

Together with 198503533, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 198503491 and 198503500.

It is not a weakly prime, because it can be changed into another prime (198503533) 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, 99251765 + 99251766.

It is an arithmetic number, because the mean of its divisors is an integer number (99251766).

Almost surely, 2^198503531 is an apocalyptic number.

198503531 is a deficient number, since it is larger than the sum of its proper divisors (1).

198503531 is an equidigital number, since it uses as much as digits as its factorization.

198503531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 198503531 is about 14089.1281135491. The cubic root of 198503531 is about 583.3413273100.

The spelling of 198503531 in words is "one hundred ninety-eight million, five hundred three thousand, five hundred thirty-one".