2161181471 has 8 divisors (see below), whose sum is σ = 2236270080. Its totient is φ = 2086130592.

The previous prime is 2161181443. The next prime is 2161181489. The reversal of 2161181471 is 1741811612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2161181471 - 2²² = 2156987167 is a prime.

It is a super-3 number, since 3×2161181471³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161181441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157346 + ... + 170528.

It is an arithmetic number, because the mean of its divisors is an integer number (279533760).

Almost surely, 2^2161181471 is an apocalyptic number.

2161181471 is a deficient number, since it is larger than the sum of its proper divisors (75088609).

2161181471 is a wasteful number, since it uses less digits than its factorization.

2161181471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18865.

The product of its digits is 2688, while the sum is 32.

The square root of 2161181471 is about 46488.5090210473. The cubic root of 2161181471 is about 1292.8964564410.

The spelling of 2161181471 in words is "two billion, one hundred sixty-one million, one hundred eighty-one thousand, four hundred seventy-one".