2171577852 has 36 divisors (see below), whose sum is σ = 5526120600. Its totient is φ = 718999392.

The previous prime is 2171577847. The next prime is 2171577853. The reversal of 2171577852 is 2587751712.

2171577852 is a `hidden beast` number, since 2 + 1 + 71 + 577 + 8 + 5 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 2171577798 and 2171577807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171577853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 197058 + ... + 207785.

It is an arithmetic number, because the mean of its divisors is an integer number (153503350).

Almost surely, 2^2171577852 is an apocalyptic number.

It is an amenable number.

2171577852 is an abundant number, since it is smaller than the sum of its proper divisors (3354542748).

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

2171577852 is a wasteful number, since it uses less digits than its factorization.

2171577852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405002 (or 404997 counting only the distinct ones).

The product of its digits is 274400, while the sum is 45.

The square root of 2171577852 is about 46600.1915446707. The cubic root of 2171577852 is about 1294.9663039388.

The spelling of 2171577852 in words is "two billion, one hundred seventy-one million, five hundred seventy-seven thousand, eight hundred fifty-two".