2871521 has 4 divisors (see below), whose sum is σ = 3040452. Its totient is φ = 2702592.

The previous prime is 2871509. The next prime is 2871563. The reversal of 2871521 is 1251782.

2871521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1661521 + 1210000 = 1289^2 + 1100^2 .

It is not a de Polignac number, because 2871521 - 2⁶ = 2871457 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2871221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84440 + ... + 84473.

It is an arithmetic number, because the mean of its divisors is an integer number (760113).

2^2871521 is an apocalyptic number.

It is an amenable number.

2871521 is a deficient number, since it is larger than the sum of its proper divisors (168931).

2871521 is a wasteful number, since it uses less digits than its factorization.

2871521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168930.

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

The square root of 2871521 is about 1694.5562841051. The cubic root of 2871521 is about 142.1359704030.

The spelling of 2871521 in words is "two million, eight hundred seventy-one thousand, five hundred twenty-one".