197111998 has 4 divisors (see below), whose sum is σ = 295668000. Its totient is φ = 98555998.

The previous prime is 197111983. The next prime is 197112007. The reversal of 197111998 is 899111791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 899111791 = 23 ⋅39091817.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49277998 + ... + 49278001.

It is an arithmetic number, because the mean of its divisors is an integer number (73917000).

Almost surely, 2^197111998 is an apocalyptic number.

197111998 is a deficient number, since it is larger than the sum of its proper divisors (98556002).

197111998 is an equidigital number, since it uses as much as digits as its factorization.

197111998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98556001.

The product of its digits is 40824, while the sum is 46.

The square root of 197111998 is about 14039.6580442687. The cubic root of 197111998 is about 581.9750326831.

The spelling of 197111998 in words is "one hundred ninety-seven million, one hundred eleven thousand, nine hundred ninety-eight".