161654271 has 4 divisors (see below), whose sum is σ = 215539032. Its totient is φ = 107769512.

The previous prime is 161654263. The next prime is 161654279. The reversal of 161654271 is 172456161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 172456161 = 3 ⋅57485387.

It is an interprime number because it is at equal distance from previous prime (161654263) and next prime (161654279).

It is a cyclic number.

It is not a de Polignac number, because 161654271 - 2³ = 161654263 is a prime.

It is a super-2 number, since 2×161654271² = 52264206665082882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161654279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26942376 + ... + 26942381.

It is an arithmetic number, because the mean of its divisors is an integer number (53884758).

Almost surely, 2^161654271 is an apocalyptic number.

161654271 is a deficient number, since it is larger than the sum of its proper divisors (53884761).

161654271 is an equidigital number, since it uses as much as digits as its factorization.

161654271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53884760.

The product of its digits is 10080, while the sum is 33.

The square root of 161654271 is about 12714.3332896381. Note that the first 3 decimals coincide. The cubic root of 161654271 is about 544.7481045626.

The spelling of 161654271 in words is "one hundred sixty-one million, six hundred fifty-four thousand, two hundred seventy-one".