724621 has 2 divisors, whose sum is σ = 724622. Its totient is φ = 724620.

The previous prime is 724609. The next prime is 724627. The reversal of 724621 is 126427.

724621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 688900 + 35721 = 830^2 + 189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-724621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 724592 and 724601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (724627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362310 + 362311.

It is an arithmetic number, because the mean of its divisors is an integer number (362311).

2⁷²⁴⁶²¹ is an apocalyptic number.

It is an amenable number.

724621 is a deficient number, since it is larger than the sum of its proper divisors (1).

724621 is an equidigital number, since it uses as much as digits as its factorization.

724621 is an evil number, because the sum of its binary digits is even.

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

The square root of 724621 is about 851.2467327397. The cubic root of 724621 is about 89.8194322062.

The spelling of 724621 in words is "seven hundred twenty-four thousand, six hundred twenty-one".