2161433271 has 4 divisors (see below), whose sum is σ = 2881911032. Its totient is φ = 1440955512.

The previous prime is 2161433269. The next prime is 2161433273. The reversal of 2161433271 is 1723341612.

It is a happy number.

2161433271 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2161433269) and next prime (2161433273).

It is not a de Polignac number, because 2161433271 - 2¹ = 2161433269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161433273) 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, 360238876 + ... + 360238881.

It is an arithmetic number, because the mean of its divisors is an integer number (720477758).

Almost surely, 2^2161433271 is an apocalyptic number.

2161433271 is a deficient number, since it is larger than the sum of its proper divisors (720477761).

2161433271 is an equidigital number, since it uses as much as digits as its factorization.

2161433271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720477760.

The product of its digits is 6048, while the sum is 30.

The square root of 2161433271 is about 46491.2171382940. The cubic root of 2161433271 is about 1292.9466664287.

Adding to 2161433271 its reverse (1723341612), we get a palindrome (3884774883).

The spelling of 2161433271 in words is "two billion, one hundred sixty-one million, four hundred thirty-three thousand, two hundred seventy-one".