161724617 has 2 divisors, whose sum is σ = 161724618. Its totient is φ = 161724616.

The previous prime is 161724611. The next prime is 161724631. The reversal of 161724617 is 716427161.

It is a happy number.

161724617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146506816 + 15217801 = 12104^2 + 3901^2 .

It is a cyclic number.

It is not a de Polignac number, because 161724617 - 2¹⁰ = 161723593 is a prime.

It is equal to p_9065735 and since 161724617 and 9065735 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (161724611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80862308 + 80862309.

It is an arithmetic number, because the mean of its divisors is an integer number (80862309).

Almost surely, 2^161724617 is an apocalyptic number.

It is an amenable number.

161724617 is a deficient number, since it is larger than the sum of its proper divisors (1).

161724617 is an equidigital number, since it uses as much as digits as its factorization.

161724617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 35.

The square root of 161724617 is about 12717.0993941229. The cubic root of 161724617 is about 544.8271112243.

The spelling of 161724617 in words is "one hundred sixty-one million, seven hundred twenty-four thousand, six hundred seventeen".