621888997 has 2 divisors, whose sum is σ = 621888998. Its totient is φ = 621888996.

The previous prime is 621888947. The next prime is 621889043. The reversal of 621888997 is 799888126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 578210116 + 43678881 = 24046^2 + 6609^2 .

It is a cyclic number.

It is not a de Polignac number, because 621888997 - 2²⁷ = 487671269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621888907) 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, 310944498 + 310944499.

It is an arithmetic number, because the mean of its divisors is an integer number (310944499).

Almost surely, 2^621888997 is an apocalyptic number.

It is an amenable number.

621888997 is a deficient number, since it is larger than the sum of its proper divisors (1).

621888997 is an equidigital number, since it uses as much as digits as its factorization.

621888997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 58.

The square root of 621888997 is about 24937.7023199813. The cubic root of 621888997 is about 853.5670156553.

The spelling of 621888997 in words is "six hundred twenty-one million, eight hundred eighty-eight thousand, nine hundred ninety-seven".