198712931 has 2 divisors, whose sum is σ = 198712932. Its totient is φ = 198712930.

The previous prime is 198712909. The next prime is 198712951. The reversal of 198712931 is 139217891.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (139217891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198712931 - 2⁶ = 198712867 is a prime.

It is a super-2 number, since 2×198712931² = 78973657893221522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198712951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99356465 + 99356466.

It is an arithmetic number, because the mean of its divisors is an integer number (99356466).

Almost surely, 2^198712931 is an apocalyptic number.

198712931 is a deficient number, since it is larger than the sum of its proper divisors (1).

198712931 is an equidigital number, since it uses as much as digits as its factorization.

198712931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 41.

The square root of 198712931 is about 14096.5574166177. The cubic root of 198712931 is about 583.5463761340.

The spelling of 198712931 in words is "one hundred ninety-eight million, seven hundred twelve thousand, nine hundred thirty-one".