721111007 has 2 divisors, whose sum is σ = 721111008. Its totient is φ = 721111006.

The previous prime is 721110991. The next prime is 721111081. The reversal of 721111007 is 700111127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 721111007 - 2⁴ = 721110991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 721111007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721111087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360555503 + 360555504.

It is an arithmetic number, because the mean of its divisors is an integer number (360555504).

Almost surely, 2^721111007 is an apocalyptic number.

721111007 is a deficient number, since it is larger than the sum of its proper divisors (1).

721111007 is an equidigital number, since it uses as much as digits as its factorization.

721111007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 98, while the sum is 20.

The square root of 721111007 is about 26853.5101429962. The cubic root of 721111007 is about 896.7417190640.

The spelling of 721111007 in words is "seven hundred twenty-one million, one hundred eleven thousand, seven".