223978549 has 2 divisors, whose sum is σ = 223978550. Its totient is φ = 223978548.

The previous prime is 223978537. The next prime is 223978561. The reversal of 223978549 is 945879322.

223978549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (223978537) and next prime (223978561).

It can be written as a sum of positive squares in only one way, i.e., 153586449 + 70392100 = 12393^2 + 8390^2 .

It is a cyclic number.

It is not a de Polignac number, because 223978549 - 2⁹ = 223978037 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 (223978949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111989274 + 111989275.

It is an arithmetic number, because the mean of its divisors is an integer number (111989275).

Almost surely, 2^223978549 is an apocalyptic number.

It is an amenable number.

223978549 is a deficient number, since it is larger than the sum of its proper divisors (1).

223978549 is an equidigital number, since it uses as much as digits as its factorization.

223978549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 49.

The square root of 223978549 is about 14965.9129023257. The cubic root of 223978549 is about 607.2984074854.

The spelling of 223978549 in words is "two hundred twenty-three million, nine hundred seventy-eight thousand, five hundred forty-nine".