197907709729 has 2 divisors, whose sum is σ = 197907709730. Its totient is φ = 197907709728.

The previous prime is 197907709691. The next prime is 197907709763. The reversal of 197907709729 is 927907709791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148878679104 + 49029030625 = 385848^2 + 221425^2 .

It is a cyclic number.

It is not a de Polignac number, because 197907709729 - 2¹¹ = 197907707681 is a prime.

It is not a weakly prime, because it can be changed into another prime (197907709789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98953854864 + 98953854865.

It is an arithmetic number, because the mean of its divisors is an integer number (98953854865).

Almost surely, 2^197907709729 is an apocalyptic number.

It is an amenable number.

197907709729 is a deficient number, since it is larger than the sum of its proper divisors (1).

197907709729 is an equidigital number, since it uses as much as digits as its factorization.

197907709729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31505922, while the sum is 67.

The spelling of 197907709729 in words is "one hundred ninety-seven billion, nine hundred seven million, seven hundred nine thousand, seven hundred twenty-nine".