197488091 has 2 divisors, whose sum is σ = 197488092. Its totient is φ = 197488090.

The previous prime is 197488087. The next prime is 197488111. The reversal of 197488091 is 190884791.

It is a weak prime.

It is an emirp because it is prime and its reverse (190884791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197488091 - 2² = 197488087 is a prime.

It is not a weakly prime, because it can be changed into another prime (197488391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98744045 + 98744046.

It is an arithmetic number, because the mean of its divisors is an integer number (98744046).

Almost surely, 2^197488091 is an apocalyptic number.

197488091 is a deficient number, since it is larger than the sum of its proper divisors (1).

197488091 is an equidigital number, since it uses as much as digits as its factorization.

197488091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 197488091 is about 14053.0456129623. The cubic root of 197488091 is about 582.3449368978.

The spelling of 197488091 in words is "one hundred ninety-seven million, four hundred eighty-eight thousand, ninety-one".