871205145 has 32 divisors (see below), whose sum is σ = 1451831040. Its totient is φ = 445697280.

The previous prime is 871205143. The next prime is 871205177. The reversal of 871205145 is 541502178.

It is not a de Polignac number, because 871205145 - 2¹ = 871205143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (871205143) 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, 28351 + ... + 50459.

It is an arithmetic number, because the mean of its divisors is an integer number (45369720).

Almost surely, 2^871205145 is an apocalyptic number.

It is an amenable number.

871205145 is a deficient number, since it is larger than the sum of its proper divisors (580625895).

871205145 is a wasteful number, since it uses less digits than its factorization.

871205145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22225.

The product of its (nonzero) digits is 11200, while the sum is 33.

The square root of 871205145 is about 29516.1844586999. The cubic root of 871205145 is about 955.0808644738.

The spelling of 871205145 in words is "eight hundred seventy-one million, two hundred five thousand, one hundred forty-five".