2148509 has 4 divisors (see below), whose sum is σ = 2343840. Its totient is φ = 1953180.

The previous prime is 2148491. The next prime is 2148527. The reversal of 2148509 is 9058412.

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 an interprime number because it is at equal distance from previous prime (2148491) and next prime (2148527).

It is a cyclic number.

It is not a de Polignac number, because 2148509 - 2¹⁶ = 2082973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2148529) 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, 97649 + ... + 97670.

It is an arithmetic number, because the mean of its divisors is an integer number (585960).

2^2148509 is an apocalyptic number.

It is an amenable number.

2148509 is a deficient number, since it is larger than the sum of its proper divisors (195331).

2148509 is a wasteful number, since it uses less digits than its factorization.

2148509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195330.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 2148509 is about 1465.7793149039. The cubic root of 2148509 is about 129.0364458446.

Subtracting 2148509 from its reverse (9058412), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 2148509 in words is "two million, one hundred forty-eight thousand, five hundred nine".