621958417 has 2 divisors, whose sum is σ = 621958418. Its totient is φ = 621958416.

The previous prime is 621958343. The next prime is 621958423. The reversal of 621958417 is 714859126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 615486481 + 6471936 = 24809^2 + 2544^2 .

It is a cyclic number.

It is not a de Polignac number, because 621958417 - 2¹⁵ = 621925649 is a prime.

It is not a weakly prime, because it can be changed into another prime (621958427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310979208 + 310979209.

It is an arithmetic number, because the mean of its divisors is an integer number (310979209).

Almost surely, 2^621958417 is an apocalyptic number.

It is an amenable number.

621958417 is a deficient number, since it is larger than the sum of its proper divisors (1).

621958417 is an equidigital number, since it uses as much as digits as its factorization.

621958417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The square root of 621958417 is about 24939.0941495476. The cubic root of 621958417 is about 853.5987750303.

The spelling of 621958417 in words is "six hundred twenty-one million, nine hundred fifty-eight thousand, four hundred seventeen".