872181007 has 4 divisors (see below), whose sum is σ = 875285136. Its totient is φ = 869076880.

The previous prime is 872180993. The next prime is 872181019. The reversal of 872181007 is 700181278.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-872181007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (872181077) 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, 1551643 + ... + 1552204.

It is an arithmetic number, because the mean of its divisors is an integer number (218821284).

Almost surely, 2^872181007 is an apocalyptic number.

872181007 is a deficient number, since it is larger than the sum of its proper divisors (3104129).

872181007 is a wasteful number, since it uses less digits than its factorization.

872181007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3104128.

The product of its (nonzero) digits is 6272, while the sum is 34.

The square root of 872181007 is about 29532.7107966743. The cubic root of 872181007 is about 955.4373359461.

The spelling of 872181007 in words is "eight hundred seventy-two million, one hundred eighty-one thousand, seven".