161927441 has 4 divisors (see below), whose sum is σ = 174383412. Its totient is φ = 149471472.

The previous prime is 161927419. The next prime is 161927459. The reversal of 161927441 is 144729161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 144729161 = 701 ⋅206461.

It can be written as a sum of positive squares in 2 ways, for example, as 110145025 + 51782416 = 10495^2 + 7196^2 .

It is a cyclic number.

It is not a de Polignac number, because 161927441 - 2⁶ = 161927377 is a prime.

It is a super-2 number, since 2×161927441² = 52440992297616962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161927411) 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, 6227966 + ... + 6227991.

It is an arithmetic number, because the mean of its divisors is an integer number (43595853).

Almost surely, 2^161927441 is an apocalyptic number.

It is an amenable number.

161927441 is a deficient number, since it is larger than the sum of its proper divisors (12455971).

161927441 is a wasteful number, since it uses less digits than its factorization.

161927441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12455970.

The product of its digits is 12096, while the sum is 35.

The square root of 161927441 is about 12725.0713553992. The cubic root of 161927441 is about 545.0547777615.

The spelling of 161927441 in words is "one hundred sixty-one million, nine hundred twenty-seven thousand, four hundred forty-one".