420950917 has 2 divisors, whose sum is σ = 420950918. Its totient is φ = 420950916.

The previous prime is 420950861. The next prime is 420950969. The reversal of 420950917 is 719059024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 419184676 + 1766241 = 20474^2 + 1329^2 .

It is a cyclic number.

It is not a de Polignac number, because 420950917 - 2²⁷ = 286733189 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 (420950987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210475458 + 210475459.

It is an arithmetic number, because the mean of its divisors is an integer number (210475459).

Almost surely, 2^420950917 is an apocalyptic number.

It is an amenable number.

420950917 is a deficient number, since it is larger than the sum of its proper divisors (1).

420950917 is an equidigital number, since it uses as much as digits as its factorization.

420950917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 420950917 is about 20517.0884142950. The cubic root of 420950917 is about 749.4519949441.

The spelling of 420950917 in words is "four hundred twenty million, nine hundred fifty thousand, nine hundred seventeen".