2177147845 has 4 divisors (see below), whose sum is σ = 2612577420. Its totient is φ = 1741718272.

The previous prime is 2177147803. The next prime is 2177147873. The reversal of 2177147845 is 5487417712.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1136633796 + 1040514049 = 33714^2 + 32257^2 .

It is a cyclic number.

It is not a de Polignac number, because 2177147845 - 2⁷ = 2177147717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2177147795 and 2177147804.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217714780 + ... + 217714789.

It is an arithmetic number, because the mean of its divisors is an integer number (653144355).

Almost surely, 2^2177147845 is an apocalyptic number.

It is an amenable number.

2177147845 is a deficient number, since it is larger than the sum of its proper divisors (435429575).

2177147845 is an equidigital number, since it uses as much as digits as its factorization.

2177147845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435429574.

The product of its digits is 439040, while the sum is 46.

The square root of 2177147845 is about 46659.9168987687. The cubic root of 2177147845 is about 1296.0725341475.

The spelling of 2177147845 in words is "two billion, one hundred seventy-seven million, one hundred forty-seven thousand, eight hundred forty-five".