613223621 has 16 divisors (see below), whose sum is σ = 638024688. Its totient is φ = 589056000.

The previous prime is 613223587. The next prime is 613223627. The reversal of 613223621 is 126322316.

It can be written as a sum of positive squares in 8 ways, for example, as 212022721 + 401200900 = 14561^2 + 20030^2 .

It is a cyclic number.

It is not a de Polignac number, because 613223621 - 2⁶ = 613223557 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 (613223627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 518651 + ... + 519831.

It is an arithmetic number, because the mean of its divisors is an integer number (39876543).

Almost surely, 2^613223621 is an apocalyptic number.

It is an amenable number.

613223621 is a deficient number, since it is larger than the sum of its proper divisors (24801067).

613223621 is a wasteful number, since it uses less digits than its factorization.

613223621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432.

The product of its digits is 2592, while the sum is 26.

The square root of 613223621 is about 24763.3523780606. The cubic root of 613223621 is about 849.5839352442.

Adding to 613223621 its reverse (126322316), we get a palindrome (739545937).

The spelling of 613223621 in words is "six hundred thirteen million, two hundred twenty-three thousand, six hundred twenty-one".