721014209 has 2 divisors, whose sum is σ = 721014210. Its totient is φ = 721014208.

The previous prime is 721014167. The next prime is 721014253. The reversal of 721014209 is 902410127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 550137025 + 170877184 = 23455^2 + 13072^2 .

It is a cyclic number.

It is not a de Polignac number, because 721014209 - 2²⁴ = 704236993 is a prime.

It is a super-2 number, since 2×721014209² = 1039722979159791362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (721014509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360507104 + 360507105.

It is an arithmetic number, because the mean of its divisors is an integer number (360507105).

Almost surely, 2^721014209 is an apocalyptic number.

It is an amenable number.

721014209 is a deficient number, since it is larger than the sum of its proper divisors (1).

721014209 is an equidigital number, since it uses as much as digits as its factorization.

721014209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 721014209 is about 26851.7077482979. The cubic root of 721014209 is about 896.7015926996.

The spelling of 721014209 in words is "seven hundred twenty-one million, fourteen thousand, two hundred nine".