2543545 has 4 divisors (see below), whose sum is σ = 3052260. Its totient is φ = 2034832.

The previous prime is 2543537. The next prime is 2543551. The reversal of 2543545 is 5453452.

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

It can be written as a sum of positive squares in 2 ways, for example, as 529984 + 2013561 = 728^2 + 1419^2 .

It is a cyclic number.

It is not a de Polignac number, because 2543545 - 2³ = 2543537 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254350 + ... + 254359.

It is an arithmetic number, because the mean of its divisors is an integer number (763065).

2^2543545 is an apocalyptic number.

It is an amenable number.

2543545 is a deficient number, since it is larger than the sum of its proper divisors (508715).

2543545 is an equidigital number, since it uses as much as digits as its factorization.

2543545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508714.

The product of its digits is 12000, while the sum is 28.

The square root of 2543545 is about 1594.8495226823. The cubic root of 2543545 is about 136.5043449265.

Adding to 2543545 its reverse (5453452), we get a palindrome (7996997).

The spelling of 2543545 in words is "two million, five hundred forty-three thousand, five hundred forty-five".