419871721 has 2 divisors, whose sum is σ = 419871722. Its totient is φ = 419871720.

The previous prime is 419871667. The next prime is 419871743. The reversal of 419871721 is 127178914.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 410508121 + 9363600 = 20261^2 + 3060^2 .

It is a cyclic number.

It is not a de Polignac number, because 419871721 - 2¹⁷ = 419740649 is a prime.

It is not a weakly prime, because it can be changed into another prime (419871521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 209935860 + 209935861.

It is an arithmetic number, because the mean of its divisors is an integer number (209935861).

Almost surely, 2^419871721 is an apocalyptic number.

It is an amenable number.

419871721 is a deficient number, since it is larger than the sum of its proper divisors (1).

419871721 is an equidigital number, since it uses as much as digits as its factorization.

419871721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 40.

The square root of 419871721 is about 20490.7716057741. The cubic root of 419871721 is about 748.8109876995.

The spelling of 419871721 in words is "four hundred nineteen million, eight hundred seventy-one thousand, seven hundred twenty-one".