161617241 has 4 divisors (see below), whose sum is σ = 161667300. Its totient is φ = 161567184.

The previous prime is 161617219. The next prime is 161617273. The reversal of 161617241 is 142716161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6739216 + 154878025 = 2596^2 + 12445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161617241 is a prime.

It is a super-2 number, since 2×161617241² = 52240265176904162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161617541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19826 + ... + 26763.

It is an arithmetic number, because the mean of its divisors is an integer number (40416825).

Almost surely, 2^161617241 is an apocalyptic number.

It is an amenable number.

161617241 is a deficient number, since it is larger than the sum of its proper divisors (50059).

161617241 is an equidigital number, since it uses as much as digits as its factorization.

161617241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50058.

The product of its digits is 2016, while the sum is 29.

The square root of 161617241 is about 12712.8769757282. The cubic root of 161617241 is about 544.7065063983.

The spelling of 161617241 in words is "one hundred sixty-one million, six hundred seventeen thousand, two hundred forty-one".