161736271 has 4 divisors (see below), whose sum is σ = 163220200. Its totient is φ = 160252344.

The previous prime is 161736233. The next prime is 161736301. The reversal of 161736271 is 172637161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 172637161 = 3499 ⋅49339.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161736271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161736221) 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, 741801 + ... + 742018.

It is an arithmetic number, because the mean of its divisors is an integer number (40805050).

Almost surely, 2^161736271 is an apocalyptic number.

161736271 is a deficient number, since it is larger than the sum of its proper divisors (1483929).

161736271 is a wasteful number, since it uses less digits than its factorization.

161736271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483928.

The product of its digits is 10584, while the sum is 34.

The square root of 161736271 is about 12717.5575878389. The cubic root of 161736271 is about 544.8401977965.

The spelling of 161736271 in words is "one hundred sixty-one million, seven hundred thirty-six thousand, two hundred seventy-one".