197473987 has 2 divisors, whose sum is σ = 197473988. Its totient is φ = 197473986.

The previous prime is 197473981. The next prime is 197474041. The reversal of 197473987 is 789374791.

It is a weak prime.

It is an emirp because it is prime and its reverse (789374791) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197473987 is a prime.

It is not a weakly prime, because it can be changed into another prime (197473981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98736993 + 98736994.

It is an arithmetic number, because the mean of its divisors is an integer number (98736994).

Almost surely, 2^197473987 is an apocalyptic number.

197473987 is a deficient number, since it is larger than the sum of its proper divisors (1).

197473987 is an equidigital number, since it uses as much as digits as its factorization.

197473987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2667168, while the sum is 55.

The square root of 197473987 is about 14052.5437910721. The cubic root of 197473987 is about 582.3310734652.

The spelling of 197473987 in words is "one hundred ninety-seven million, four hundred seventy-three thousand, nine hundred eighty-seven".