12542549 has 4 divisors (see below), whose sum is σ = 13280364. Its totient is φ = 11804736.

The previous prime is 12542539. The next prime is 12542557. The reversal of 12542549 is 94524521.

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 3928324 + 8614225 = 1982^2 + 2935^2 .

It is a cyclic number.

It is not a de Polignac number, because 12542549 - 2⁸ = 12542293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12542539) 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, 368882 + ... + 368915.

It is an arithmetic number, because the mean of its divisors is an integer number (3320091).

Almost surely, 2^12542549 is an apocalyptic number.

It is an amenable number.

12542549 is a deficient number, since it is larger than the sum of its proper divisors (737815).

12542549 is an equidigital number, since it uses as much as digits as its factorization.

12542549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737814.

The product of its digits is 14400, while the sum is 32.

The square root of 12542549 is about 3541.5461312822. The cubic root of 12542549 is about 232.3424700812.

The spelling of 12542549 in words is "twelve million, five hundred forty-two thousand, five hundred forty-nine".