621845201 has 4 divisors (see below), whose sum is σ = 621896100. Its totient is φ = 621794304.

The previous prime is 621845179. The next prime is 621845219. The reversal of 621845201 is 102548126.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 102548126 = 2 ⋅51274063.

It can be written as a sum of positive squares in 2 ways, for example, as 158734801 + 463110400 = 12599^2 + 21520^2 .

It is a cyclic number.

It is not a de Polignac number, because 621845201 - 2⁶ = 621845137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621845251) 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, 5105 + ... + 35633.

It is an arithmetic number, because the mean of its divisors is an integer number (155474025).

Almost surely, 2^621845201 is an apocalyptic number.

It is an amenable number.

621845201 is a deficient number, since it is larger than the sum of its proper divisors (50899).

621845201 is a wasteful number, since it uses less digits than its factorization.

621845201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50898.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 621845201 is about 24936.8241963567. The cubic root of 621845201 is about 853.5469779429.

The spelling of 621845201 in words is "six hundred twenty-one million, eight hundred forty-five thousand, two hundred one".