2161531416 has 96 divisors (see below), whose sum is σ = 6100582320. Its totient is φ = 637274880.

The previous prime is 2161531381. The next prime is 2161531469. The reversal of 2161531416 is 6141351612.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 97390 + ... + 117506.

Almost surely, 2^2161531416 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2161531416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3050291160).

2161531416 is an abundant number, since it is smaller than the sum of its proper divisors (3939050904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2161531416 is a wasteful number, since it uses less digits than its factorization.

2161531416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20185 (or 20170 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 2161531416 is about 46492.2726482584. The cubic root of 2161531416 is about 1292.9662359017.

The spelling of 2161531416 in words is "two billion, one hundred sixty-one million, five hundred thirty-one thousand, four hundred sixteen".