222721549 has 2 divisors, whose sum is σ = 222721550. Its totient is φ = 222721548.

The previous prime is 222721523. The next prime is 222721567. The reversal of 222721549 is 945127222.

It is a happy number.

222721549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222308100 + 413449 = 14910^2 + 643^2 .

It is a cyclic number.

It is not a de Polignac number, because 222721549 - 2¹³ = 222713357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222721589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111360774 + 111360775.

It is an arithmetic number, because the mean of its divisors is an integer number (111360775).

Almost surely, 2^222721549 is an apocalyptic number.

It is an amenable number.

222721549 is a deficient number, since it is larger than the sum of its proper divisors (1).

222721549 is an equidigital number, since it uses as much as digits as its factorization.

222721549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 34.

The square root of 222721549 is about 14923.8583817993. The cubic root of 222721549 is about 606.1601933929.

The spelling of 222721549 in words is "two hundred twenty-two million, seven hundred twenty-one thousand, five hundred forty-nine".