724221013 has 2 divisors, whose sum is σ = 724221014. Its totient is φ = 724221012.

The previous prime is 724220999. The next prime is 724221037. The reversal of 724221013 is 310122427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 650913169 + 73307844 = 25513^2 + 8562^2 .

It is a cyclic number.

It is not a de Polignac number, because 724221013 - 2¹⁷ = 724089941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (724221413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362110506 + 362110507.

It is an arithmetic number, because the mean of its divisors is an integer number (362110507).

Almost surely, 2^724221013 is an apocalyptic number.

It is an amenable number.

724221013 is a deficient number, since it is larger than the sum of its proper divisors (1).

724221013 is an equidigital number, since it uses as much as digits as its factorization.

724221013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 724221013 is about 26911.3547224959. The cubic root of 724221013 is about 898.0290254555.

The spelling of 724221013 in words is "seven hundred twenty-four million, two hundred twenty-one thousand, thirteen".