420243911 has 2 divisors, whose sum is σ = 420243912. Its totient is φ = 420243910.

The previous prime is 420243883. The next prime is 420243913. The reversal of 420243911 is 119342024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420243911 - 2¹⁴ = 420227527 is a prime.

Together with 420243913, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420243913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210121955 + 210121956.

It is an arithmetic number, because the mean of its divisors is an integer number (210121956).

Almost surely, 2^420243911 is an apocalyptic number.

420243911 is a deficient number, since it is larger than the sum of its proper divisors (1).

420243911 is an equidigital number, since it uses as much as digits as its factorization.

420243911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 420243911 is about 20499.8514872669. The cubic root of 420243911 is about 749.0321803782.

Adding to 420243911 its reverse (119342024), we get a palindrome (539585935).

The spelling of 420243911 in words is "four hundred twenty million, two hundred forty-three thousand, nine hundred eleven".