623505221 has 8 divisors (see below), whose sum is σ = 631337304. Its totient is φ = 615720960.

The previous prime is 623505143. The next prime is 623505227. The reversal of 623505221 is 122505326.

It can be written as a sum of positive squares in 4 ways, for example, as 20802721 + 602702500 = 4561^2 + 24550^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 623505221 - 2¹⁰ = 623504197 is a prime.

It is a super-2 number, since 2×623505221² = 777517521228517682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (623505227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14651 + ... + 38231.

It is an arithmetic number, because the mean of its divisors is an integer number (78917163).

Almost surely, 2^623505221 is an apocalyptic number.

It is an amenable number.

623505221 is a deficient number, since it is larger than the sum of its proper divisors (7832083).

623505221 is a wasteful number, since it uses less digits than its factorization.

623505221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23911.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 623505221 is about 24970.0865236787. The cubic root of 623505221 is about 854.3058195893.

The spelling of 623505221 in words is "six hundred twenty-three million, five hundred five thousand, two hundred twenty-one".