197981097 has 16 divisors (see below), whose sum is σ = 273341952. Its totient is φ = 127330560.

The previous prime is 197981093. The next prime is 197981107. The reversal of 197981097 is 790189791.

It is not a de Polignac number, because 197981097 - 2² = 197981093 is a prime.

It is not an unprimeable number, because it can be changed into a prime (197981093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28183 + ... + 34499.

It is an arithmetic number, because the mean of its divisors is an integer number (17083872).

Almost surely, 2^197981097 is an apocalyptic number.

It is an amenable number.

197981097 is a deficient number, since it is larger than the sum of its proper divisors (75360855).

197981097 is a wasteful number, since it uses less digits than its factorization.

197981097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6688.

The product of its (nonzero) digits is 285768, while the sum is 51.

The square root of 197981097 is about 14070.5755745812. The cubic root of 197981097 is about 582.8291196381.

The spelling of 197981097 in words is "one hundred ninety-seven million, nine hundred eighty-one thousand, ninety-seven".