2158513 has 4 divisors (see below), whose sum is σ = 2466880. Its totient is φ = 1850148.

The previous prime is 2158501. The next prime is 2158523. The reversal of 2158513 is 3158512.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2158513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2158523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154173 + ... + 154186.

It is an arithmetic number, because the mean of its divisors is an integer number (616720).

2^2158513 is an apocalyptic number.

It is an amenable number.

2158513 is a deficient number, since it is larger than the sum of its proper divisors (308367).

2158513 is an equidigital number, since it uses as much as digits as its factorization.

2158513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308366.

The product of its digits is 1200, while the sum is 25.

The square root of 2158513 is about 1469.1878709001. The cubic root of 2158513 is about 129.2364112184.

Subtracting 2158513 from its reverse (3158512), we obtain a palindrome (999999).

The spelling of 2158513 in words is "two million, one hundred fifty-eight thousand, five hundred thirteen".