198312971 has 2 divisors, whose sum is σ = 198312972. Its totient is φ = 198312970.

The previous prime is 198312967. The next prime is 198312977. The reversal of 198312971 is 179213891.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198312971 - 2² = 198312967 is a prime.

It is not a weakly prime, because it can be changed into another prime (198312977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99156485 + 99156486.

It is an arithmetic number, because the mean of its divisors is an integer number (99156486).

Almost surely, 2^198312971 is an apocalyptic number.

198312971 is a deficient number, since it is larger than the sum of its proper divisors (1).

198312971 is an equidigital number, since it uses as much as digits as its factorization.

198312971 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 198312971 is about 14082.3638285623. The cubic root of 198312971 is about 583.1546016418.

The spelling of 198312971 in words is "one hundred ninety-eight million, three hundred twelve thousand, nine hundred seventy-one".