872649181 has 16 divisors (see below), whose sum is σ = 920937600. Its totient is φ = 825830208.

The previous prime is 872649139. The next prime is 872649199. The reversal of 872649181 is 181946278.

It is a cyclic number.

It is not a de Polignac number, because 872649181 - 2⁷ = 872649053 is a prime.

It is a super-2 number, since 2×872649181² = 1523033186199941522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (872641181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 426960 + ... + 428998.

It is an arithmetic number, because the mean of its divisors is an integer number (57558600).

Almost surely, 2^872649181 is an apocalyptic number.

It is an amenable number.

872649181 is a deficient number, since it is larger than the sum of its proper divisors (48288419).

872649181 is a wasteful number, since it uses less digits than its factorization.

872649181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2388.

The product of its digits is 193536, while the sum is 46.

The square root of 872649181 is about 29540.6360967397. The cubic root of 872649181 is about 955.6082602928.

The spelling of 872649181 in words is "eight hundred seventy-two million, six hundred forty-nine thousand, one hundred eighty-one".