2161487847 has 32 divisors (see below), whose sum is σ = 2978809344. Its totient is φ = 1393603200.

The previous prime is 2161487821. The next prime is 2161487849. The reversal of 2161487847 is 7487841612.

It is not a de Polignac number, because 2161487847 - 2²² = 2157293543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2161487796 and 2161487805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161487849) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3269697 + ... + 3270357.

It is an arithmetic number, because the mean of its divisors is an integer number (93087792).

Almost surely, 2^2161487847 is an apocalyptic number.

2161487847 is a deficient number, since it is larger than the sum of its proper divisors (817321497).

2161487847 is a wasteful number, since it uses less digits than its factorization.

2161487847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999.

The product of its digits is 602112, while the sum is 48.

The square root of 2161487847 is about 46491.8040841609. The cubic root of 2161487847 is about 1292.9575486003.

The spelling of 2161487847 in words is "two billion, one hundred sixty-one million, four hundred eighty-seven thousand, eight hundred forty-seven".