198858031 has 2 divisors, whose sum is σ = 198858032. Its totient is φ = 198858030.

The previous prime is 198858019. The next prime is 198858151. The reversal of 198858031 is 130858891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198858031 - 2¹¹ = 198855983 is a prime.

It is a super-2 number, since 2×198858031² = 79089032986393922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198858001) 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, 99429015 + 99429016.

It is an arithmetic number, because the mean of its divisors is an integer number (99429016).

Almost surely, 2^198858031 is an apocalyptic number.

198858031 is a deficient number, since it is larger than the sum of its proper divisors (1).

198858031 is an equidigital number, since it uses as much as digits as its factorization.

198858031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 43.

The square root of 198858031 is about 14101.7031240911. The cubic root of 198858031 is about 583.6883765863.

The spelling of 198858031 in words is "one hundred ninety-eight million, eight hundred fifty-eight thousand, thirty-one".