721283 has 2 divisors, whose sum is σ = 721284. Its totient is φ = 721282.

The previous prime is 721267. The next prime is 721291. The reversal of 721283 is 382127.

It is a strong prime.

721283 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 721283 - 2⁴ = 721267 is a prime.

It is equal to p₅₈₁₃₆ and since 721283 and 58136 have the same sum of digits, it is a Honaker prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721283.

It is not a weakly prime, because it can be changed into another prime (721213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360641 + 360642.

It is an arithmetic number, because the mean of its divisors is an integer number (360642).

2⁷²¹²⁸³ is an apocalyptic number.

721283 is a deficient number, since it is larger than the sum of its proper divisors (1).

721283 is an equidigital number, since it uses as much as digits as its factorization.

721283 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 23.

The square root of 721283 is about 849.2838159296. The cubic root of 721283 is about 89.6813007690.

The spelling of 721283 in words is "seven hundred twenty-one thousand, two hundred eighty-three".