621229841 has 2 divisors, whose sum is σ = 621229842. Its totient is φ = 621229840.

The previous prime is 621229823. The next prime is 621229849. The reversal of 621229841 is 148922126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 504676225 + 116553616 = 22465^2 + 10796^2 .

It is a cyclic number.

It is not a de Polignac number, because 621229841 - 2²² = 617035537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (621229849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310614920 + 310614921.

It is an arithmetic number, because the mean of its divisors is an integer number (310614921).

Almost surely, 2^621229841 is an apocalyptic number.

It is an amenable number.

621229841 is a deficient number, since it is larger than the sum of its proper divisors (1).

621229841 is an equidigital number, since it uses as much as digits as its factorization.

621229841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 35.

The square root of 621229841 is about 24924.4827629381. The cubic root of 621229841 is about 853.2653365653.

The spelling of 621229841 in words is "six hundred twenty-one million, two hundred twenty-nine thousand, eight hundred forty-one".