197015687161 has 2 divisors, whose sum is σ = 197015687162. Its totient is φ = 197015687160.

The previous prime is 197015687153. The next prime is 197015687191. The reversal of 197015687161 is 161786510791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98658810000 + 98356877161 = 314100^2 + 313619^2 .

It is a cyclic number.

It is not a de Polignac number, because 197015687161 - 2³ = 197015687153 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 197015687099 and 197015687108.

It is not a weakly prime, because it can be changed into another prime (197015687131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98507843580 + 98507843581.

It is an arithmetic number, because the mean of its divisors is an integer number (98507843581).

Almost surely, 2^197015687161 is an apocalyptic number.

It is an amenable number.

197015687161 is a deficient number, since it is larger than the sum of its proper divisors (1).

197015687161 is an equidigital number, since it uses as much as digits as its factorization.

197015687161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 52.

The spelling of 197015687161 in words is "one hundred ninety-seven billion, fifteen million, six hundred eighty-seven thousand, one hundred sixty-one".