197719967 has 4 divisors (see below), whose sum is σ = 197995680. Its totient is φ = 197444256.

The previous prime is 197719943. The next prime is 197719969. The reversal of 197719967 is 769917791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 769917791 = 19 ⋅40521989.

It is a cyclic number.

It is not a de Polignac number, because 197719967 - 2⁶ = 197719903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197719969) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 136778 + ... + 138215.

It is an arithmetic number, because the mean of its divisors is an integer number (49498920).

Almost surely, 2^197719967 is an apocalyptic number.

197719967 is a deficient number, since it is larger than the sum of its proper divisors (275713).

197719967 is an equidigital number, since it uses as much as digits as its factorization.

197719967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275712.

The product of its digits is 1500282, while the sum is 56.

The square root of 197719967 is about 14061.2932193309. The cubic root of 197719967 is about 582.5727632952.

The spelling of 197719967 in words is "one hundred ninety-seven million, seven hundred nineteen thousand, nine hundred sixty-seven".