198001957 has 2 divisors, whose sum is σ = 198001958. Its totient is φ = 198001956.

The previous prime is 198001943. The next prime is 198001967. The reversal of 198001957 is 759100891.

It is a happy number.

198001957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128346241 + 69655716 = 11329^2 + 8346^2 .

It is a cyclic number.

It is not a de Polignac number, because 198001957 - 2⁷ = 198001829 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198001927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99000978 + 99000979.

It is an arithmetic number, because the mean of its divisors is an integer number (99000979).

Almost surely, 2^198001957 is an apocalyptic number.

It is an amenable number.

198001957 is a deficient number, since it is larger than the sum of its proper divisors (1).

198001957 is an equidigital number, since it uses as much as digits as its factorization.

198001957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 198001957 is about 14071.3168182654. The cubic root of 198001957 is about 582.8495885762.

The spelling of 198001957 in words is "one hundred ninety-eight million, one thousand, nine hundred fifty-seven".