2161306956 has 12 divisors (see below), whose sum is σ = 5043049592. Its totient is φ = 720435648.

The previous prime is 2161306933. The next prime is 2161306963. The reversal of 2161306956 is 6596031612.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90054445 + ... + 90054468.

Almost surely, 2^2161306956 is an apocalyptic number.

It is an amenable number.

2161306956 is an abundant number, since it is smaller than the sum of its proper divisors (2881742636).

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

2161306956 is a wasteful number, since it uses less digits than its factorization.

2161306956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180108920 (or 180108918 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 2161306956 is about 46489.8586360509. The cubic root of 2161306956 is about 1292.9214791696.

The spelling of 2161306956 in words is "two billion, one hundred sixty-one million, three hundred six thousand, nine hundred fifty-six".