721349413 has 2 divisors, whose sum is σ = 721349414. Its totient is φ = 721349412.

The previous prime is 721349407. The next prime is 721349507. The reversal of 721349413 is 314943127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 555403489 + 165945924 = 23567^2 + 12882^2 .

It is an emirp because it is prime and its reverse (314943127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 721349413 - 2²⁵ = 687794981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721349113) 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, 360674706 + 360674707.

It is an arithmetic number, because the mean of its divisors is an integer number (360674707).

Almost surely, 2^721349413 is an apocalyptic number.

It is an amenable number.

721349413 is a deficient number, since it is larger than the sum of its proper divisors (1).

721349413 is an equidigital number, since it uses as much as digits as its factorization.

721349413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 34.

The square root of 721349413 is about 26857.9487861601. The cubic root of 721349413 is about 896.8405318905.

The spelling of 721349413 in words is "seven hundred twenty-one million, three hundred forty-nine thousand, four hundred thirteen".