197840015987 has 2 divisors, whose sum is σ = 197840015988. Its totient is φ = 197840015986.

The previous prime is 197840015941. The next prime is 197840016001. The reversal of 197840015987 is 789510048791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197840015987 - 2⁸ = 197840015731 is a prime.

It is not a weakly prime, because it can be changed into another prime (197840095987) 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 as a sum of consecutive naturals, namely, 98920007993 + 98920007994.

It is an arithmetic number, because the mean of its divisors is an integer number (98920007994).

Almost surely, 2^197840015987 is an apocalyptic number.

197840015987 is a deficient number, since it is larger than the sum of its proper divisors (1).

197840015987 is an equidigital number, since it uses as much as digits as its factorization.

197840015987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5080320, while the sum is 59.

The spelling of 197840015987 in words is "one hundred ninety-seven billion, eight hundred forty million, fifteen thousand, nine hundred eighty-seven".