621729047 has 2 divisors, whose sum is σ = 621729048. Its totient is φ = 621729046.

The previous prime is 621729041. The next prime is 621729089. The reversal of 621729047 is 740927126.

621729047 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 621729047 - 2⁶ = 621728983 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 621729047.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621729041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310864523 + 310864524.

It is an arithmetic number, because the mean of its divisors is an integer number (310864524).

Almost surely, 2^621729047 is an apocalyptic number.

621729047 is a deficient number, since it is larger than the sum of its proper divisors (1).

621729047 is an equidigital number, since it uses as much as digits as its factorization.

621729047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 621729047 is about 24934.4951222197. The cubic root of 621729047 is about 853.4938301665.

The spelling of 621729047 in words is "six hundred twenty-one million, seven hundred twenty-nine thousand, forty-seven".