161946271 has 2 divisors, whose sum is σ = 161946272. Its totient is φ = 161946270.

The previous prime is 161946241. The next prime is 161946307. The reversal of 161946271 is 172649161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161946271 - 2⁷ = 161946143 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161946271.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161946221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80973135 + 80973136.

It is an arithmetic number, because the mean of its divisors is an integer number (80973136).

Almost surely, 2^161946271 is an apocalyptic number.

161946271 is a deficient number, since it is larger than the sum of its proper divisors (1).

161946271 is an equidigital number, since it uses as much as digits as its factorization.

161946271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 161946271 is about 12725.8112118639. The cubic root of 161946271 is about 545.0759044744.

The spelling of 161946271 in words is "one hundred sixty-one million, nine hundred forty-six thousand, two hundred seventy-one".