198431263 has 2 divisors, whose sum is σ = 198431264. Its totient is φ = 198431262.

The previous prime is 198431209. The next prime is 198431291. The reversal of 198431263 is 362134891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198431263 is a prime.

It is a super-2 number, since 2×198431263² = 78749932271550338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198437263) 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, 99215631 + 99215632.

It is an arithmetic number, because the mean of its divisors is an integer number (99215632).

Almost surely, 2^198431263 is an apocalyptic number.

198431263 is a deficient number, since it is larger than the sum of its proper divisors (1).

198431263 is an equidigital number, since it uses as much as digits as its factorization.

198431263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 198431263 is about 14086.5632075393. The cubic root of 198431263 is about 583.2705275148.

The spelling of 198431263 in words is "one hundred ninety-eight million, four hundred thirty-one thousand, two hundred sixty-three".