721642343 has 2 divisors, whose sum is σ = 721642344. Its totient is φ = 721642342.

The previous prime is 721642309. The next prime is 721642373. The reversal of 721642343 is 343246127.

721642343 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 is a cyclic number.

It is not a de Polignac number, because 721642343 - 2⁶ = 721642279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721642373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360821171 + 360821172.

It is an arithmetic number, because the mean of its divisors is an integer number (360821172).

Almost surely, 2^721642343 is an apocalyptic number.

721642343 is a deficient number, since it is larger than the sum of its proper divisors (1).

721642343 is an equidigital number, since it uses as much as digits as its factorization.

721642343 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 721642343 is about 26863.4015530424. The cubic root of 721642343 is about 896.9619136320.

The spelling of 721642343 in words is "seven hundred twenty-one million, six hundred forty-two thousand, three hundred forty-three".