161597197 has 2 divisors, whose sum is σ = 161597198. Its totient is φ = 161597196.

The previous prime is 161597143. The next prime is 161597239. The reversal of 161597197 is 791795161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91891396 + 69705801 = 9586^2 + 8349^2 .

It is a cyclic number.

It is not a de Polignac number, because 161597197 - 2⁷ = 161597069 is a prime.

It is a super-2 number, since 2×161597197² = 52227308156513618, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161597297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80798598 + 80798599.

It is an arithmetic number, because the mean of its divisors is an integer number (80798599).

Almost surely, 2^161597197 is an apocalyptic number.

It is an amenable number.

161597197 is a deficient number, since it is larger than the sum of its proper divisors (1).

161597197 is an equidigital number, since it uses as much as digits as its factorization.

161597197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 119070, while the sum is 46.

The square root of 161597197 is about 12712.0886167459. The cubic root of 161597197 is about 544.6839870422.

The spelling of 161597197 in words is "one hundred sixty-one million, five hundred ninety-seven thousand, one hundred ninety-seven".