2545549 has 4 divisors (see below), whose sum is σ = 2551264. Its totient is φ = 2539836.

The previous prime is 2545523. The next prime is 2545553. The reversal of 2545549 is 9455452.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 2545549 - 2²¹ = 448397 is a prime.

It is a super-2 number, since 2×2545549² = 12959639422802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2545519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2127 + ... + 3100.

It is an arithmetic number, because the mean of its divisors is an integer number (637816).

2^2545549 is an apocalyptic number.

It is an amenable number.

2545549 is a deficient number, since it is larger than the sum of its proper divisors (5715).

2545549 is an equidigital number, since it uses as much as digits as its factorization.

2545549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5714.

The product of its digits is 36000, while the sum is 34.

The square root of 2545549 is about 1595.4776714201. The cubic root of 2545549 is about 136.5401850494.

Subtracting 2545549 from its reverse (9455452), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 2545549 in words is "two million, five hundred forty-five thousand, five hundred forty-nine".