161161597 has 2 divisors, whose sum is σ = 161161598. Its totient is φ = 161161596.

The previous prime is 161161579. The next prime is 161161607. The reversal of 161161597 is 795161161.

Together with previous prime (161161579) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148693636 + 12467961 = 12194^2 + 3531^2 .

It is a cyclic number.

It is not a de Polignac number, because 161161597 - 2¹¹ = 161159549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161161577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80580798 + 80580799.

It is an arithmetic number, because the mean of its divisors is an integer number (80580799).

Almost surely, 2^161161597 is an apocalyptic number.

It is an amenable number.

161161597 is a deficient number, since it is larger than the sum of its proper divisors (1).

161161597 is an equidigital number, since it uses as much as digits as its factorization.

161161597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 37.

The square root of 161161597 is about 12694.9437572602. The cubic root of 161161597 is about 544.1941314873.

The spelling of 161161597 in words is "one hundred sixty-one million, one hundred sixty-one thousand, five hundred ninety-seven".