621442447 has 2 divisors, whose sum is σ = 621442448. Its totient is φ = 621442446.

The previous prime is 621442439. The next prime is 621442477. The reversal of 621442447 is 744244126.

621442447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621442447 - 2³ = 621442439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621442477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310721223 + 310721224.

It is an arithmetic number, because the mean of its divisors is an integer number (310721224).

Almost surely, 2^621442447 is an apocalyptic number.

621442447 is a deficient number, since it is larger than the sum of its proper divisors (1).

621442447 is an equidigital number, since it uses as much as digits as its factorization.

621442447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 34.

The square root of 621442447 is about 24928.7474013437. The cubic root of 621442447 is about 853.3626642784.

The spelling of 621442447 in words is "six hundred twenty-one million, four hundred forty-two thousand, four hundred forty-seven".