743221 has 2 divisors, whose sum is σ = 743222. Its totient is φ = 743220.

The previous prime is 743209. The next prime is 743251. The reversal of 743221 is 122347.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 504100 + 239121 = 710^2 + 489^2 .

It is an emirp because it is prime and its reverse (122347) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 743221 - 2¹⁷ = 612149 is a prime.

It is an Ulam number.

It is a nialpdrome in base 10 and base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (743251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371610 + 371611.

It is an arithmetic number, because the mean of its divisors is an integer number (371611).

2⁷⁴³²²¹ is an apocalyptic number.

It is an amenable number.

743221 is a deficient number, since it is larger than the sum of its proper divisors (1).

743221 is an equidigital number, since it uses as much as digits as its factorization.

743221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 19.

The square root of 743221 is about 862.1026621001. The cubic root of 743221 is about 90.5814616073.

Adding to 743221 its reverse (122347), we get a palindrome (865568).

The spelling of 743221 in words is "seven hundred forty-three thousand, two hundred twenty-one", and thus it is an iban number.