621043873 has 2 divisors, whose sum is σ = 621043874. Its totient is φ = 621043872.

The previous prime is 621043817. The next prime is 621043897. The reversal of 621043873 is 378340126.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 344919184 + 276124689 = 18572^2 + 16617^2 .

It is a cyclic number.

It is not a de Polignac number, because 621043873 - 2⁹ = 621043361 is a prime.

It is not a weakly prime, because it can be changed into another prime (621043273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310521936 + 310521937.

It is an arithmetic number, because the mean of its divisors is an integer number (310521937).

Almost surely, 2^621043873 is an apocalyptic number.

It is an amenable number.

621043873 is a deficient number, since it is larger than the sum of its proper divisors (1).

621043873 is an equidigital number, since it uses as much as digits as its factorization.

621043873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 621043873 is about 24920.7518546291. The cubic root of 621043873 is about 853.1801851049.

Adding to 621043873 its reverse (378340126), we get a palindrome (999383999).

The spelling of 621043873 in words is "six hundred twenty-one million, forty-three thousand, eight hundred seventy-three".