871239049 has 4 divisors (see below), whose sum is σ = 872689300. Its totient is φ = 869788800.

The previous prime is 871239043. The next prime is 871239077. The reversal of 871239049 is 940932178.

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 435473424 + 435765625 = 20868^2 + 20875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-871239049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 871238996 and 871239014.

It is not an unprimeable number, because it can be changed into a prime (871239043) 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, 724224 + ... + 725425.

It is an arithmetic number, because the mean of its divisors is an integer number (218172325).

Almost surely, 2^871239049 is an apocalyptic number.

It is an amenable number.

871239049 is a deficient number, since it is larger than the sum of its proper divisors (1450251).

871239049 is a wasteful number, since it uses less digits than its factorization.

871239049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1450250.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 871239049 is about 29516.7587820885. The cubic root of 871239049 is about 955.0932536880.

The spelling of 871239049 in words is "eight hundred seventy-one million, two hundred thirty-nine thousand, forty-nine".