621279223 has 2 divisors, whose sum is σ = 621279224. Its totient is φ = 621279222.

The previous prime is 621279221. The next prime is 621279283. The reversal of 621279223 is 322972126.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621279223 - 2¹ = 621279221 is a prime.

Together with 621279221, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621279221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310639611 + 310639612.

It is an arithmetic number, because the mean of its divisors is an integer number (310639612).

Almost surely, 2^621279223 is an apocalyptic number.

621279223 is a deficient number, since it is larger than the sum of its proper divisors (1).

621279223 is an equidigital number, since it uses as much as digits as its factorization.

621279223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 34.

The square root of 621279223 is about 24925.4733756452. The cubic root of 621279223 is about 853.2879448549.

The spelling of 621279223 in words is "six hundred twenty-one million, two hundred seventy-nine thousand, two hundred twenty-three".