623223221 has 2 divisors, whose sum is σ = 623223222. Its totient is φ = 623223220.

The previous prime is 623223197. The next prime is 623223283. The reversal of 623223221 is 122322326.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 397803025 + 225420196 = 19945^2 + 15014^2 .

It is a cyclic number.

It is not a de Polignac number, because 623223221 - 2²⁶ = 556114357 is a prime.

It is a super-2 number, since 2×623223221² = 776814366387229682, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623223121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311611610 + 311611611.

It is an arithmetic number, because the mean of its divisors is an integer number (311611611).

Almost surely, 2^623223221 is an apocalyptic number.

It is an amenable number.

623223221 is a deficient number, since it is larger than the sum of its proper divisors (1).

623223221 is an equidigital number, since it uses as much as digits as its factorization.

623223221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 23.

The square root of 623223221 is about 24964.4391284883. The cubic root of 623223221 is about 854.1770045382.

Adding to 623223221 its reverse (122322326), we get a palindrome (745545547).

The spelling of 623223221 in words is "six hundred twenty-three million, two hundred twenty-three thousand, two hundred twenty-one".