623366221 has 2 divisors, whose sum is σ = 623366222. Its totient is φ = 623366220.

The previous prime is 623366213. The next prime is 623366257. The reversal of 623366221 is 122663326.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 375933321 + 247432900 = 19389^2 + 15730^2 .

It is a cyclic number.

It is not a de Polignac number, because 623366221 - 2³ = 623366213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623366291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311683110 + 311683111.

It is an arithmetic number, because the mean of its divisors is an integer number (311683111).

Almost surely, 2^623366221 is an apocalyptic number.

It is an amenable number.

623366221 is a deficient number, since it is larger than the sum of its proper divisors (1).

623366221 is an equidigital number, since it uses as much as digits as its factorization.

623366221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 31.

The square root of 623366221 is about 24967.3030381737. The cubic root of 623366221 is about 854.2423305009.

The spelling of 623366221 in words is "six hundred twenty-three million, three hundred sixty-six thousand, two hundred twenty-one".