2145523 has 4 divisors (see below), whose sum is σ = 2169720. Its totient is φ = 2121328.

The previous prime is 2145497. The next prime is 2145529. The reversal of 2145523 is 3255412.

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 2145523 - 2²¹ = 48371 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2145494 and 2145503.

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, 11965 + ... + 12142.

It is an arithmetic number, because the mean of its divisors is an integer number (542430).

2^2145523 is an apocalyptic number.

2145523 is a deficient number, since it is larger than the sum of its proper divisors (24197).

2145523 is an equidigital number, since it uses as much as digits as its factorization.

2145523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24196.

The product of its digits is 1200, while the sum is 22.

The square root of 2145523 is about 1464.7603899614. The cubic root of 2145523 is about 128.9766398018.

The spelling of 2145523 in words is "two million, one hundred forty-five thousand, five hundred twenty-three".