161217599 has 2 divisors, whose sum is σ = 161217600. Its totient is φ = 161217598.

The previous prime is 161217587. The next prime is 161217607. The reversal of 161217599 is 995712161.

It is a strong prime.

It is an emirp because it is prime and its reverse (995712161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161217599 is a prime.

It is a super-2 number, since 2×161217599² = 51982228454649602, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161217569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80608799 + 80608800.

It is an arithmetic number, because the mean of its divisors is an integer number (80608800).

Almost surely, 2^161217599 is an apocalyptic number.

161217599 is a deficient number, since it is larger than the sum of its proper divisors (1).

161217599 is an equidigital number, since it uses as much as digits as its factorization.

161217599 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34020, while the sum is 41.

The square root of 161217599 is about 12697.1492469767. The cubic root of 161217599 is about 544.2571581449.

The spelling of 161217599 in words is "one hundred sixty-one million, two hundred seventeen thousand, five hundred ninety-nine".