198845011931 has 2 divisors, whose sum is σ = 198845011932. Its totient is φ = 198845011930.

The previous prime is 198845011903. The next prime is 198845011997. The reversal of 198845011931 is 139110548891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198845011931 - 2⁶ = 198845011867 is a prime.

It is a super-2 number, since 2×198845011931² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 198845011931.

It is not a weakly prime, because it can be changed into another prime (198844011931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99422505965 + 99422505966.

It is an arithmetic number, because the mean of its divisors is an integer number (99422505966).

Almost surely, 2^198845011931 is an apocalyptic number.

198845011931 is a deficient number, since it is larger than the sum of its proper divisors (1).

198845011931 is an equidigital number, since it uses as much as digits as its factorization.

198845011931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 50.

The spelling of 198845011931 in words is "one hundred ninety-eight billion, eight hundred forty-five million, eleven thousand, nine hundred thirty-one".