621345601 has 2 divisors, whose sum is σ = 621345602. Its totient is φ = 621345600.

The previous prime is 621345583. The next prime is 621345607. The reversal of 621345601 is 106543126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 456890625 + 164454976 = 21375^2 + 12824^2 .

It is a cyclic number.

It is not a de Polignac number, because 621345601 - 2²⁷ = 487127873 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 621345601.

It is not a weakly prime, because it can be changed into another prime (621345607) 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 as a sum of consecutive naturals, namely, 310672800 + 310672801.

It is an arithmetic number, because the mean of its divisors is an integer number (310672801).

Almost surely, 2^621345601 is an apocalyptic number.

It is an amenable number.

621345601 is a deficient number, since it is larger than the sum of its proper divisors (1).

621345601 is an equidigital number, since it uses as much as digits as its factorization.

621345601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 621345601 is about 24926.8048694573. The cubic root of 621345601 is about 853.3183324423.

Adding to 621345601 its reverse (106543126), we get a palindrome (727888727).

The spelling of 621345601 in words is "six hundred twenty-one million, three hundred forty-five thousand, six hundred one".