721327093 has 2 divisors, whose sum is σ = 721327094. Its totient is φ = 721327092.

The previous prime is 721327073. The next prime is 721327129. The reversal of 721327093 is 390723127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 677144484 + 44182609 = 26022^2 + 6647^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721327093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721327043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360663546 + 360663547.

It is an arithmetic number, because the mean of its divisors is an integer number (360663547).

Almost surely, 2^721327093 is an apocalyptic number.

It is an amenable number.

721327093 is a deficient number, since it is larger than the sum of its proper divisors (1).

721327093 is an equidigital number, since it uses as much as digits as its factorization.

721327093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 34.

The square root of 721327093 is about 26857.5332634998. The cubic root of 721327093 is about 896.8312817792.

The spelling of 721327093 in words is "seven hundred twenty-one million, three hundred twenty-seven thousand, ninety-three".