872210081 has 4 divisors (see below), whose sum is σ = 872294832. Its totient is φ = 872125332.

The previous prime is 872210069. The next prime is 872210083. The reversal of 872210081 is 180012278.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 180012278 = 2 ⋅90006139.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-872210081 is a prime.

It is a super-2 number, since 2×872210081² = 1521500850796053122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (872210083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24395 + ... + 48368.

It is an arithmetic number, because the mean of its divisors is an integer number (218073708).

Almost surely, 2^872210081 is an apocalyptic number.

It is an amenable number.

872210081 is a deficient number, since it is larger than the sum of its proper divisors (84751).

872210081 is a wasteful number, since it uses less digits than its factorization.

872210081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84750.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 872210081 is about 29533.2030264243. The cubic root of 872210081 is about 955.4479522731.

The spelling of 872210081 in words is "eight hundred seventy-two million, two hundred ten thousand, eighty-one".