2145539 has 4 divisors (see below), whose sum is σ = 2340600. Its totient is φ = 1950480.

The previous prime is 2145529. The next prime is 2145547. The reversal of 2145539 is 9355412.

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

It is a cyclic number.

It is not a de Polignac number, because 2145539 - 2¹⁶ = 2080003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145529) 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, 97514 + ... + 97535.

It is an arithmetic number, because the mean of its divisors is an integer number (585150).

2^2145539 is an apocalyptic number.

2145539 is a deficient number, since it is larger than the sum of its proper divisors (195061).

2145539 is a wasteful number, since it uses less digits than its factorization.

2145539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195060.

The product of its digits is 5400, while the sum is 29.

The square root of 2145539 is about 1464.7658515954. The cubic root of 2145539 is about 128.9769604107.

It can be divided in two parts, 2 and 145539, that added together give a palindrome (145541).

The spelling of 2145539 in words is "two million, one hundred forty-five thousand, five hundred thirty-nine".