416720621 has 2 divisors, whose sum is σ = 416720622. Its totient is φ = 416720620.

The previous prime is 416720581. The next prime is 416720641. The reversal of 416720621 is 126027614.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 401401225 + 15319396 = 20035^2 + 3914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-416720621 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 (416720641) 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, 208360310 + 208360311.

It is an arithmetic number, because the mean of its divisors is an integer number (208360311).

Almost surely, 2^416720621 is an apocalyptic number.

It is an amenable number.

416720621 is a deficient number, since it is larger than the sum of its proper divisors (1).

416720621 is an equidigital number, since it uses as much as digits as its factorization.

416720621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 416720621 is about 20413.7360862729. The cubic root of 416720621 is about 746.9330285288.

The spelling of 416720621 in words is "four hundred sixteen million, seven hundred twenty thousand, six hundred twenty-one".