621324817 has 4 divisors (see below), whose sum is σ = 621581796. Its totient is φ = 621067840.

The previous prime is 621324799. The next prime is 621324839. The reversal of 621324817 is 718423126.

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

It can be written as a sum of positive squares in 2 ways, for example, as 264908176 + 356416641 = 16276^2 + 18879^2 .

It is a cyclic number.

It is not a de Polignac number, because 621324817 - 2¹⁹ = 620800529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621328817) 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, 124828 + ... + 129709.

It is an arithmetic number, because the mean of its divisors is an integer number (155395449).

Almost surely, 2^621324817 is an apocalyptic number.

It is an amenable number.

621324817 is a deficient number, since it is larger than the sum of its proper divisors (256979).

621324817 is a wasteful number, since it uses less digits than its factorization.

621324817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256978.

The product of its digits is 16128, while the sum is 34.

The square root of 621324817 is about 24926.3879653671. The cubic root of 621324817 is about 853.3088178416.

The spelling of 621324817 in words is "six hundred twenty-one million, three hundred twenty-four thousand, eight hundred seventeen".