197942191 has 2 divisors, whose sum is σ = 197942192. Its totient is φ = 197942190.

The previous prime is 197942167. The next prime is 197942233. The reversal of 197942191 is 191249791.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197942191 - 2¹³ = 197933999 is a prime.

It is a super-2 number, since 2×197942191² = 78362221955760962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197942111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98971095 + 98971096.

It is an arithmetic number, because the mean of its divisors is an integer number (98971096).

Almost surely, 2^197942191 is an apocalyptic number.

197942191 is a deficient number, since it is larger than the sum of its proper divisors (1).

197942191 is an equidigital number, since it uses as much as digits as its factorization.

197942191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 43.

The square root of 197942191 is about 14069.1929761447. The cubic root of 197942191 is about 582.7909391660.

The spelling of 197942191 in words is "one hundred ninety-seven million, nine hundred forty-two thousand, one hundred ninety-one".