721496089 has 2 divisors, whose sum is σ = 721496090. Its totient is φ = 721496088.

The previous prime is 721496071. The next prime is 721496093. The reversal of 721496089 is 980694127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 552626064 + 168870025 = 23508^2 + 12995^2 .

It is a cyclic number.

It is not a de Polignac number, because 721496089 - 2²¹ = 719398937 is a prime.

It is not a weakly prime, because it can be changed into another prime (721496029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360748044 + 360748045.

It is an arithmetic number, because the mean of its divisors is an integer number (360748045).

Almost surely, 2^721496089 is an apocalyptic number.

It is an amenable number.

721496089 is a deficient number, since it is larger than the sum of its proper divisors (1).

721496089 is an equidigital number, since it uses as much as digits as its factorization.

721496089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 721496089 is about 26860.6792356411. The cubic root of 721496089 is about 896.9013143003.

The spelling of 721496089 in words is "seven hundred twenty-one million, four hundred ninety-six thousand, eighty-nine".