621146863 has 2 divisors, whose sum is σ = 621146864. Its totient is φ = 621146862.

The previous prime is 621146821. The next prime is 621146873. The reversal of 621146863 is 368641126.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-621146863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621146873) 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, 310573431 + 310573432.

It is an arithmetic number, because the mean of its divisors is an integer number (310573432).

Almost surely, 2^621146863 is an apocalyptic number.

621146863 is a deficient number, since it is larger than the sum of its proper divisors (1).

621146863 is an equidigital number, since it uses as much as digits as its factorization.

621146863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 37.

The square root of 621146863 is about 24922.8181191454. The cubic root of 621146863 is about 853.2273445055.

Adding to 621146863 its reverse (368641126), we get a palindrome (989787989).

The spelling of 621146863 in words is "six hundred twenty-one million, one hundred forty-six thousand, eight hundred sixty-three".