871990133 has 12 divisors (see below), whose sum is σ = 1024818732. Its totient is φ = 739710720.

The previous prime is 871990127. The next prime is 871990157. The reversal of 871990133 is 331099178.

It can be written as a sum of positive squares in 2 ways, for example, as 537173329 + 334816804 = 23177^2 + 18298^2 .

It is not a de Polignac number, because 871990133 - 2⁴ = 871990117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871996133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86978 + ... + 96483.

It is an arithmetic number, because the mean of its divisors is an integer number (85401561).

Almost surely, 2^871990133 is an apocalyptic number.

It is an amenable number.

871990133 is a deficient number, since it is larger than the sum of its proper divisors (152828599).

871990133 is a wasteful number, since it uses less digits than its factorization.

871990133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183572 (or 183565 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 871990133 is about 29529.4790506030. The cubic root of 871990133 is about 955.3676327347.

The spelling of 871990133 in words is "eight hundred seventy-one million, nine hundred ninety thousand, one hundred thirty-three".