743642321 has 2 divisors, whose sum is σ = 743642322. Its totient is φ = 743642320.

The previous prime is 743642309. The next prime is 743642359. The reversal of 743642321 is 123246347.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 677040400 + 66601921 = 26020^2 + 8161^2 .

It is a cyclic number.

It is not a de Polignac number, because 743642321 - 2⁶ = 743642257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (743642381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371821160 + 371821161.

It is an arithmetic number, because the mean of its divisors is an integer number (371821161).

Almost surely, 2^743642321 is an apocalyptic number.

It is an amenable number.

743642321 is a deficient number, since it is larger than the sum of its proper divisors (1).

743642321 is an equidigital number, since it uses as much as digits as its factorization.

743642321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 32.

The square root of 743642321 is about 27269.8060315801. The cubic root of 743642321 is about 905.9857480455.

Adding to 743642321 its reverse (123246347), we get a palindrome (866888668).

The spelling of 743642321 in words is "seven hundred forty-three million, six hundred forty-two thousand, three hundred twenty-one".