872181841 has 4 divisors (see below), whose sum is σ = 873362800. Its totient is φ = 871000884.

The previous prime is 872181839. The next prime is 872181859. The reversal of 872181841 is 148181278.

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 872181841 - 2¹ = 872181839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 872181794 and 872181803.

It is not an unprimeable number, because it can be changed into a prime (872181811) 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, 589371 + ... + 590848.

It is an arithmetic number, because the mean of its divisors is an integer number (218340700).

Almost surely, 2^872181841 is an apocalyptic number.

It is an amenable number.

872181841 is a deficient number, since it is larger than the sum of its proper divisors (1180959).

872181841 is a wasteful number, since it uses less digits than its factorization.

872181841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180958.

The product of its digits is 28672, while the sum is 40.

The square root of 872181841 is about 29532.7249166073. The cubic root of 872181841 is about 955.4376404832.

The spelling of 872181841 in words is "eight hundred seventy-two million, one hundred eighty-one thousand, eight hundred forty-one".