197278401017 has 2 divisors, whose sum is σ = 197278401018. Its totient is φ = 197278401016.

The previous prime is 197278401011. The next prime is 197278401043. The reversal of 197278401017 is 710104872791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124142770921 + 73135630096 = 352339^2 + 270436^2 .

It is a cyclic number.

It is not a de Polignac number, because 197278401017 - 2¹² = 197278396921 is a prime.

It is not a weakly prime, because it can be changed into another prime (197278401011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98639200508 + 98639200509.

It is an arithmetic number, because the mean of its divisors is an integer number (98639200509).

Almost surely, 2^197278401017 is an apocalyptic number.

It is an amenable number.

197278401017 is a deficient number, since it is larger than the sum of its proper divisors (1).

197278401017 is an equidigital number, since it uses as much as digits as its factorization.

197278401017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 197568, while the sum is 47.

The spelling of 197278401017 in words is "one hundred ninety-seven billion, two hundred seventy-eight million, four hundred one thousand, seventeen".