721267 has 2 divisors, whose sum is σ = 721268. Its totient is φ = 721266.

The previous prime is 721261. The next prime is 721283. The reversal of 721267 is 762127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721267 - 2⁷ = 721139 is a prime.

721267 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (721261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360633 + 360634.

It is an arithmetic number, because the mean of its divisors is an integer number (360634).

2⁷²¹²⁶⁷ is an apocalyptic number.

721267 is a deficient number, since it is larger than the sum of its proper divisors (1).

721267 is an equidigital number, since it uses as much as digits as its factorization.

721267 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1176, while the sum is 25.

The square root of 721267 is about 849.2743961759. The cubic root of 721267 is about 89.6806376398.

The spelling of 721267 in words is "seven hundred twenty-one thousand, two hundred sixty-seven".