197871742039 has 2 divisors, whose sum is σ = 197871742040. Its totient is φ = 197871742038.

The previous prime is 197871742021. The next prime is 197871742153. The reversal of 197871742039 is 930247178791.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197871742039 - 2³⁷ = 60432788567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197871742639) 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, 98935871019 + 98935871020.

It is an arithmetic number, because the mean of its divisors is an integer number (98935871020).

Almost surely, 2^197871742039 is an apocalyptic number.

197871742039 is a deficient number, since it is larger than the sum of its proper divisors (1).

197871742039 is an equidigital number, since it uses as much as digits as its factorization.

197871742039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5334336, while the sum is 58.

The spelling of 197871742039 in words is "one hundred ninety-seven billion, eight hundred seventy-one million, seven hundred forty-two thousand, thirty-nine".