161040617 has 4 divisors (see below), whose sum is σ = 161303940. Its totient is φ = 160777296.

The previous prime is 161040611. The next prime is 161040647. The reversal of 161040617 is 716040161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 716040161 = 241 ⋅2971121.

It can be written as a sum of positive squares in 2 ways, for example, as 29800681 + 131239936 = 5459^2 + 11456^2 .

It is a cyclic number.

It is not a de Polignac number, because 161040617 - 2⁸ = 161040361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161040611) 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 in 3 ways as a sum of consecutive naturals, for example, 130742 + ... + 131967.

It is an arithmetic number, because the mean of its divisors is an integer number (40325985).

Almost surely, 2^161040617 is an apocalyptic number.

It is an amenable number.

161040617 is a deficient number, since it is larger than the sum of its proper divisors (263323).

161040617 is an equidigital number, since it uses as much as digits as its factorization.

161040617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263322.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 161040617 is about 12690.1779735353. The cubic root of 161040617 is about 544.0579264026.

Adding to 161040617 its reverse (716040161), we get a palindrome (877080778).

The spelling of 161040617 in words is "one hundred sixty-one million, forty thousand, six hundred seventeen".