197331091 has 2 divisors, whose sum is σ = 197331092. Its totient is φ = 197331090.

The previous prime is 197331083. The next prime is 197331097. The reversal of 197331091 is 190133791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197331091 - 2³ = 197331083 is a prime.

It is not a weakly prime, because it can be changed into another prime (197331097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98665545 + 98665546.

It is an arithmetic number, because the mean of its divisors is an integer number (98665546).

Almost surely, 2^197331091 is an apocalyptic number.

197331091 is a deficient number, since it is larger than the sum of its proper divisors (1).

197331091 is an equidigital number, since it uses as much as digits as its factorization.

197331091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5103, while the sum is 34.

The square root of 197331091 is about 14047.4585245873. The cubic root of 197331091 is about 582.1905775584.

The spelling of 197331091 in words is "one hundred ninety-seven million, three hundred thirty-one thousand, ninety-one".