198926958121 has 2 divisors, whose sum is σ = 198926958122. Its totient is φ = 198926958120.

The previous prime is 198926958103. The next prime is 198926958187. The reversal of 198926958121 is 121859629891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174002442496 + 24924515625 = 417136^2 + 157875^2 .

It is a cyclic number.

It is not a de Polignac number, because 198926958121 - 2⁷ = 198926957993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198926958121.

It is not a weakly prime, because it can be changed into another prime (198926956121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99463479060 + 99463479061.

It is an arithmetic number, because the mean of its divisors is an integer number (99463479061).

Almost surely, 2^198926958121 is an apocalyptic number.

It is an amenable number.

198926958121 is a deficient number, since it is larger than the sum of its proper divisors (1).

198926958121 is an equidigital number, since it uses as much as digits as its factorization.

198926958121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5598720, while the sum is 61.

The spelling of 198926958121 in words is "one hundred ninety-eight billion, nine hundred twenty-six million, nine hundred fifty-eight thousand, one hundred twenty-one".