721225607 has 2 divisors, whose sum is σ = 721225608. Its totient is φ = 721225606.

The previous prime is 721225591. The next prime is 721225639. The reversal of 721225607 is 706522127.

It is an a-pointer prime, because the next prime (721225639) can be obtained adding 721225607 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721225607 - 2⁴ = 721225591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721225657) 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, 360612803 + 360612804.

It is an arithmetic number, because the mean of its divisors is an integer number (360612804).

Almost surely, 2^721225607 is an apocalyptic number.

721225607 is a deficient number, since it is larger than the sum of its proper divisors (1).

721225607 is an equidigital number, since it uses as much as digits as its factorization.

721225607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 721225607 is about 26855.6438574837. The cubic root of 721225607 is about 896.7892203764.

The spelling of 721225607 in words is "seven hundred twenty-one million, two hundred twenty-five thousand, six hundred seven".