197793000491 has 4 divisors (see below), whose sum is σ = 197866287000. Its totient is φ = 197719713984.

The previous prime is 197793000467. The next prime is 197793000529. The reversal of 197793000491 is 194000397791.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197793000491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197793090491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36639206 + ... + 36644603.

It is an arithmetic number, because the mean of its divisors is an integer number (49466571750).

Almost surely, 2^197793000491 is an apocalyptic number.

197793000491 is a deficient number, since it is larger than the sum of its proper divisors (73286509).

197793000491 is an equidigital number, since it uses as much as digits as its factorization.

197793000491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73286508.

The product of its (nonzero) digits is 428652, while the sum is 50.

The spelling of 197793000491 in words is "one hundred ninety-seven billion, seven hundred ninety-three million, four hundred ninety-one", and thus it is an aban number.