2187513 has 8 divisors (see below), whose sum is σ = 3240800. Its totient is φ = 1458324.

The previous prime is 2187511. The next prime is 2187517. The reversal of 2187513 is 3157812.

It is not a de Polignac number, because 2187513 - 2¹ = 2187511 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 81019 = 2187513 / (2 + 1 + 8 + 7 + 5 + 1 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2187511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40483 + ... + 40536.

It is an arithmetic number, because the mean of its divisors is an integer number (405100).

2^2187513 is an apocalyptic number.

It is an amenable number.

2187513 is a deficient number, since it is larger than the sum of its proper divisors (1053287).

2187513 is an equidigital number, since it uses as much as digits as its factorization.

2187513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81028 (or 81022 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 2187513 is about 1479.0243405705. The cubic root of 2187513 is about 129.8126096979.

Subtracting 2187513 from its reverse (3157812), we obtain a cube (970299 = 99³).

The spelling of 2187513 in words is "two million, one hundred eighty-seven thousand, five hundred thirteen".