420913193 has 2 divisors, whose sum is σ = 420913194. Its totient is φ = 420913192.

The previous prime is 420913159. The next prime is 420913211. The reversal of 420913193 is 391319024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 398521369 + 22391824 = 19963^2 + 4732^2 .

It is a cyclic number.

It is not a de Polignac number, because 420913193 - 2⁸ = 420912937 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (420913123) 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, 210456596 + 210456597.

It is an arithmetic number, because the mean of its divisors is an integer number (210456597).

Almost surely, 2^420913193 is an apocalyptic number.

It is an amenable number.

420913193 is a deficient number, since it is larger than the sum of its proper divisors (1).

420913193 is an equidigital number, since it uses as much as digits as its factorization.

420913193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 420913193 is about 20516.1690624736. The cubic root of 420913193 is about 749.4296066081.

The spelling of 420913193 in words is "four hundred twenty million, nine hundred thirteen thousand, one hundred ninety-three".