621424547 has 4 divisors (see below), whose sum is σ = 621498600. Its totient is φ = 621350496.

The previous prime is 621424537. The next prime is 621424549. The reversal of 621424547 is 745424126.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 621424547 - 2¹⁴ = 621408163 is a prime.

It is a super-2 number, since 2×621424547² = 772336935228310418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621424549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22553 + ... + 41850.

It is an arithmetic number, because the mean of its divisors is an integer number (155374650).

Almost surely, 2^621424547 is an apocalyptic number.

621424547 is a deficient number, since it is larger than the sum of its proper divisors (74053).

621424547 is an equidigital number, since it uses as much as digits as its factorization.

621424547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74052.

The product of its digits is 53760, while the sum is 35.

The square root of 621424547 is about 24928.3883755047. The cubic root of 621424547 is about 853.3544707933.

The spelling of 621424547 in words is "six hundred twenty-one million, four hundred twenty-four thousand, five hundred forty-seven".