18872549 has 2 divisors, whose sum is σ = 18872550. Its totient is φ = 18872548.

The previous prime is 18872543. The next prime is 18872561. The reversal of 18872549 is 94527881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9721924 + 9150625 = 3118^2 + 3025^2 .

It is a cyclic number.

It is not a de Polignac number, because 18872549 - 2¹⁶ = 18807013 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18872543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9436274 + 9436275.

It is an arithmetic number, because the mean of its divisors is an integer number (9436275).

Almost surely, 2^18872549 is an apocalyptic number.

It is an amenable number.

18872549 is a deficient number, since it is larger than the sum of its proper divisors (1).

18872549 is an equidigital number, since it uses as much as digits as its factorization.

18872549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 44.

The square root of 18872549 is about 4344.2547116853. The cubic root of 18872549 is about 266.2421758521.

The spelling of 18872549 in words is "eighteen million, eight hundred seventy-two thousand, five hundred forty-nine".