621742873 has 2 divisors, whose sum is σ = 621742874. Its totient is φ = 621742872.

The previous prime is 621742801. The next prime is 621742889. The reversal of 621742873 is 378247126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 371217289 + 250525584 = 19267^2 + 15828^2 .

It is a cyclic number.

It is not a de Polignac number, because 621742873 - 2⁹ = 621742361 is a prime.

It is equal to p_32399446 and since 621742873 and 32399446 have the same sum of digits, it is a Honaker prime.

It is a weakly prime.

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, 310871436 + 310871437.

It is an arithmetic number, because the mean of its divisors is an integer number (310871437).

Almost surely, 2^621742873 is an apocalyptic number.

It is an amenable number.

621742873 is a deficient number, since it is larger than the sum of its proper divisors (1).

621742873 is an equidigital number, since it uses as much as digits as its factorization.

621742873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 40.

The square root of 621742873 is about 24934.7723671182. The cubic root of 621742873 is about 853.5001567800.

Adding to 621742873 its reverse (378247126), we get a palindrome (999989999).

The spelling of 621742873 in words is "six hundred twenty-one million, seven hundred forty-two thousand, eight hundred seventy-three".