621522047 has 2 divisors, whose sum is σ = 621522048. Its totient is φ = 621522046.

The previous prime is 621522037. The next prime is 621522071. The reversal of 621522047 is 740225126.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 621522047 - 2²⁰ = 620473471 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621522037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310761023 + 310761024.

It is an arithmetic number, because the mean of its divisors is an integer number (310761024).

Almost surely, 2^621522047 is an apocalyptic number.

621522047 is a deficient number, since it is larger than the sum of its proper divisors (1).

621522047 is an equidigital number, since it uses as much as digits as its factorization.

621522047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 621522047 is about 24930.3439005562. The cubic root of 621522047 is about 853.3990982064.

The spelling of 621522047 in words is "six hundred twenty-one million, five hundred twenty-two thousand, forty-seven".