161317847 has 4 divisors (see below), whose sum is σ = 169808280. Its totient is φ = 152827416.

The previous prime is 161317789. The next prime is 161317853. The reversal of 161317847 is 748713161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 748713161 = 7 ⋅106959023.

It is a cyclic number.

It is not a de Polignac number, because 161317847 - 2²² = 157123543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161317847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161317867) 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, 4245188 + ... + 4245225.

It is an arithmetic number, because the mean of its divisors is an integer number (42452070).

Almost surely, 2^161317847 is an apocalyptic number.

161317847 is a deficient number, since it is larger than the sum of its proper divisors (8490433).

161317847 is an equidigital number, since it uses as much as digits as its factorization.

161317847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8490432.

The product of its digits is 28224, while the sum is 38.

The square root of 161317847 is about 12701.0962912656. The cubic root of 161317847 is about 544.3699443976.

The spelling of 161317847 in words is "one hundred sixty-one million, three hundred seventeen thousand, eight hundred forty-seven".