621440201 has 6 divisors (see below), whose sum is σ = 655869402. Its totient is φ = 588732480.

The previous prime is 621440191. The next prime is 621440221. The reversal of 621440201 is 102044126.

It can be written as a sum of positive squares in only one way, i.e., 613850176 + 7590025 = 24776^2 + 2755^2 .

It is a de Polignac number, because none of the positive numbers 2^k-621440201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621440221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 860360 + ... + 861081.

It is an arithmetic number, because the mean of its divisors is an integer number (109311567).

Almost surely, 2^621440201 is an apocalyptic number.

It is an amenable number.

621440201 is a deficient number, since it is larger than the sum of its proper divisors (34429201).

621440201 is a wasteful number, since it uses less digits than its factorization.

621440201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1721479 (or 1721460 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 621440201 is about 24928.7023529104. The cubic root of 621440201 is about 853.3616362106.

Adding to 621440201 its reverse (102044126), we get a palindrome (723484327).

The spelling of 621440201 in words is "six hundred twenty-one million, four hundred forty thousand, two hundred one".