621229823 has 2 divisors, whose sum is σ = 621229824. Its totient is φ = 621229822.

The previous prime is 621229799. The next prime is 621229841. The reversal of 621229823 is 328922126.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 621229823 - 2¹⁸ = 620967679 is a prime.

It is a super-2 number, since 2×621229823² = 771852985969222658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621229853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310614911 + 310614912.

It is an arithmetic number, because the mean of its divisors is an integer number (310614912).

Almost surely, 2^621229823 is an apocalyptic number.

621229823 is a deficient number, since it is larger than the sum of its proper divisors (1).

621229823 is an equidigital number, since it uses as much as digits as its factorization.

621229823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The square root of 621229823 is about 24924.4824018474. The cubic root of 621229823 is about 853.2653283242.

The spelling of 621229823 in words is "six hundred twenty-one million, two hundred twenty-nine thousand, eight hundred twenty-three".