871217251 has 4 divisors (see below), whose sum is σ = 873644400. Its totient is φ = 868790104.

The previous prime is 871217227. The next prime is 871217257. The reversal of 871217251 is 152712178.

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

It is a cyclic number.

It is not a de Polignac number, because 871217251 - 2⁹ = 871216739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (871217257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1213036 + ... + 1213753.

It is an arithmetic number, because the mean of its divisors is an integer number (218411100).

Almost surely, 2^871217251 is an apocalyptic number.

871217251 is a deficient number, since it is larger than the sum of its proper divisors (2427149).

871217251 is a wasteful number, since it uses less digits than its factorization.

871217251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2427148.

The product of its digits is 7840, while the sum is 34.

The square root of 871217251 is about 29516.3895319194. The cubic root of 871217251 is about 955.0852882904.

The spelling of 871217251 in words is "eight hundred seventy-one million, two hundred seventeen thousand, two hundred fifty-one".