161671441 has 4 divisors (see below), whose sum is σ = 162606132. Its totient is φ = 160736752.

The previous prime is 161671409. The next prime is 161671457. The reversal of 161671441 is 144176161.

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 141610000 + 20061441 = 11900^2 + 4479^2 .

It is a cyclic number.

It is not a de Polignac number, because 161671441 - 2⁵ = 161671409 is a prime.

It is a super-2 number, since 2×161671441² = 52275309670032962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161671141) 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, 467086 + ... + 467431.

It is an arithmetic number, because the mean of its divisors is an integer number (40651533).

Almost surely, 2^161671441 is an apocalyptic number.

It is an amenable number.

161671441 is a deficient number, since it is larger than the sum of its proper divisors (934691).

161671441 is an equidigital number, since it uses as much as digits as its factorization.

161671441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934690.

The product of its digits is 4032, while the sum is 31.

The square root of 161671441 is about 12715.0084939020. The cubic root of 161671441 is about 544.7673905647.

The spelling of 161671441 in words is "one hundred sixty-one million, six hundred seventy-one thousand, four hundred forty-one".