2643545 has 4 divisors (see below), whose sum is σ = 3172260. Its totient is φ = 2114832.

The previous prime is 2643523. The next prime is 2643547. The reversal of 2643545 is 5453462.

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 1517824 + 1125721 = 1232^2 + 1061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2643545 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2643547) 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, 264350 + ... + 264359.

It is an arithmetic number, because the mean of its divisors is an integer number (793065).

2^2643545 is an apocalyptic number.

It is an amenable number.

2643545 is a deficient number, since it is larger than the sum of its proper divisors (528715).

2643545 is an equidigital number, since it uses as much as digits as its factorization.

2643545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528714.

The product of its digits is 14400, while the sum is 29.

The square root of 2643545 is about 1625.8982132963. The cubic root of 2643545 is about 138.2702991796.

The spelling of 2643545 in words is "two million, six hundred forty-three thousand, five hundred forty-five".