721483913 has 4 divisors (see below), whose sum is σ = 721679508. Its totient is φ = 721288320.

The previous prime is 721483883. The next prime is 721483933. The reversal of 721483913 is 319384127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 319384127 = 137 ⋅2331271.

It can be written as a sum of positive squares in 2 ways, for example, as 468419449 + 253064464 = 21643^2 + 15908^2 .

It is a cyclic number.

It is not a de Polignac number, because 721483913 - 2¹⁰ = 721482889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721483933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92156 + ... + 99677.

It is an arithmetic number, because the mean of its divisors is an integer number (180419877).

Almost surely, 2^721483913 is an apocalyptic number.

It is an amenable number.

721483913 is a deficient number, since it is larger than the sum of its proper divisors (195595).

721483913 is a wasteful number, since it uses less digits than its factorization.

721483913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195594.

The product of its digits is 36288, while the sum is 38.

The square root of 721483913 is about 26860.4525836777. The cubic root of 721483913 is about 896.8962688898.

The spelling of 721483913 in words is "seven hundred twenty-one million, four hundred eighty-three thousand, nine hundred thirteen".