721433413 has 4 divisors (see below), whose sum is σ = 721541740. Its totient is φ = 721325088.

The previous prime is 721433407. The next prime is 721433423. The reversal of 721433413 is 314334127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 563730049 + 157703364 = 23743^2 + 12558^2 .

It is a cyclic number.

It is not a de Polignac number, because 721433413 - 2²⁹ = 184562501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721433423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43470 + ... + 57727.

It is an arithmetic number, because the mean of its divisors is an integer number (180385435).

Almost surely, 2^721433413 is an apocalyptic number.

It is an amenable number.

721433413 is a deficient number, since it is larger than the sum of its proper divisors (108327).

721433413 is a wasteful number, since it uses less digits than its factorization.

721433413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108326.

The product of its digits is 6048, while the sum is 28.

The square root of 721433413 is about 26859.5125234990. The cubic root of 721433413 is about 896.8753424272.

The spelling of 721433413 in words is "seven hundred twenty-one million, four hundred thirty-three thousand, four hundred thirteen".