2161587712 has 20 divisors (see below), whose sum is σ = 4318954596. Its totient is φ = 1080793600.

The previous prime is 2161587709. The next prime is 2161587731. The reversal of 2161587712 is 2177851612.

It is a super-2 number, since 2×2161587712² = 9344922873338789888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2110414 + ... + 2111437.

Almost surely, 2^2161587712 is an apocalyptic number.

It is an amenable number.

2161587712 is a deficient number, since it is larger than the sum of its proper divisors (2157366884).

2161587712 is an frugal number, since it uses more digits than its factorization.

2161587712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4221869 (or 4221853 counting only the distinct ones).

The product of its digits is 47040, while the sum is 40.

The square root of 2161587712 is about 46492.8780782605. The cubic root of 2161587712 is about 1292.9774606896.

The spelling of 2161587712 in words is "two billion, one hundred sixty-one million, five hundred eighty-seven thousand, seven hundred twelve".