871001540 has 24 divisors (see below), whose sum is σ = 1873717272. Its totient is φ = 339902720.

The previous prime is 871001519. The next prime is 871001561. The reversal of 871001540 is 45100178.

It is an interprime number because it is at equal distance from previous prime (871001519) and next prime (871001561).

It can be written as a sum of positive squares in 4 ways, for example, as 515524 + 870486016 = 718^2 + 29504^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 530279 + ... + 531918.

It is an arithmetic number, because the mean of its divisors is an integer number (78071553).

Almost surely, 2^871001540 is an apocalyptic number.

It is an amenable number.

871001540 is an abundant number, since it is smaller than the sum of its proper divisors (1002715732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

871001540 is a wasteful number, since it uses less digits than its factorization.

871001540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062247 (or 1062245 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 871001540 is about 29512.7352171906. The cubic root of 871001540 is about 955.0064562852.

The spelling of 871001540 in words is "eight hundred seventy-one million, one thousand, five hundred forty".