721210733 has 2 divisors, whose sum is σ = 721210734. Its totient is φ = 721210732.

The previous prime is 721210717. The next prime is 721210739. The reversal of 721210733 is 337012127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 560884489 + 160326244 = 23683^2 + 12662^2 .

It is a cyclic number.

It is not a de Polignac number, because 721210733 - 2⁴ = 721210717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721210739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360605366 + 360605367.

It is an arithmetic number, because the mean of its divisors is an integer number (360605367).

Almost surely, 2^721210733 is an apocalyptic number.

It is an amenable number.

721210733 is a deficient number, since it is larger than the sum of its proper divisors (1).

721210733 is an equidigital number, since it uses as much as digits as its factorization.

721210733 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 721210733 is about 26855.3669310252. The cubic root of 721210733 is about 896.7830554379.

The spelling of 721210733 in words is "seven hundred twenty-one million, two hundred ten thousand, seven hundred thirty-three".