621247853 has 2 divisors, whose sum is σ = 621247854. Its totient is φ = 621247852.

The previous prime is 621247829. The next prime is 621247873. The reversal of 621247853 is 358742126.

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., 432515209 + 188732644 = 20797^2 + 13738^2 .

It is a cyclic number.

It is not a de Polignac number, because 621247853 - 2⁸ = 621247597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621247873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310623926 + 310623927.

It is an arithmetic number, because the mean of its divisors is an integer number (310623927).

Almost surely, 2^621247853 is an apocalyptic number.

It is an amenable number.

621247853 is a deficient number, since it is larger than the sum of its proper divisors (1).

621247853 is an equidigital number, since it uses as much as digits as its factorization.

621247853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 38.

The square root of 621247853 is about 24924.8440917892. The cubic root of 621247853 is about 853.2735830390.

Adding to 621247853 its reverse (358742126), we get a palindrome (979989979).

The spelling of 621247853 in words is "six hundred twenty-one million, two hundred forty-seven thousand, eight hundred fifty-three".