223540549 has 2 divisors, whose sum is σ = 223540550. Its totient is φ = 223540548.

The previous prime is 223540547. The next prime is 223540553. The reversal of 223540549 is 945045322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213364449 + 10176100 = 14607^2 + 3190^2 .

It is a cyclic number.

It is not a de Polignac number, because 223540549 - 2¹ = 223540547 is a prime.

Together with 223540547, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223540547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111770274 + 111770275.

It is an arithmetic number, because the mean of its divisors is an integer number (111770275).

Almost surely, 2^223540549 is an apocalyptic number.

It is an amenable number.

223540549 is a deficient number, since it is larger than the sum of its proper divisors (1).

223540549 is an equidigital number, since it uses as much as digits as its factorization.

223540549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 223540549 is about 14951.2724876513. The cubic root of 223540549 is about 606.9022828242.

The spelling of 223540549 in words is "two hundred twenty-three million, five hundred forty thousand, five hundred forty-nine".