871870813 has 4 divisors (see below), whose sum is σ = 951131808. Its totient is φ = 792609820.

The previous prime is 871870807. The next prime is 871870837. The reversal of 871870813 is 318078178.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 871870813 - 2²⁹ = 334999901 is a prime.

It is a super-2 number, since 2×871870813² = 1520317429122561938, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 871870813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871870843) 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, 39630481 + ... + 39630502.

It is an arithmetic number, because the mean of its divisors is an integer number (237782952).

Almost surely, 2^871870813 is an apocalyptic number.

It is an amenable number.

871870813 is a deficient number, since it is larger than the sum of its proper divisors (79260995).

871870813 is a wasteful number, since it uses less digits than its factorization.

871870813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79260994.

The product of its (nonzero) digits is 75264, while the sum is 43.

The square root of 871870813 is about 29527.4586275216. The cubic root of 871870813 is about 955.3240543877.

The spelling of 871870813 in words is "eight hundred seventy-one million, eight hundred seventy thousand, eight hundred thirteen".