420500111 has 2 divisors, whose sum is σ = 420500112. Its totient is φ = 420500110.

The previous prime is 420500081. The next prime is 420500137. The reversal of 420500111 is 111005024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420500111 - 2²² = 416305807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420500011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210250055 + 210250056.

It is an arithmetic number, because the mean of its divisors is an integer number (210250056).

Almost surely, 2^420500111 is an apocalyptic number.

420500111 is a deficient number, since it is larger than the sum of its proper divisors (1).

420500111 is an equidigital number, since it uses as much as digits as its factorization.

420500111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 420500111 is about 20506.0993609219. The cubic root of 420500111 is about 749.1843642690.

Adding to 420500111 its reverse (111005024), we get a palindrome (531505135).

The spelling of 420500111 in words is "four hundred twenty million, five hundred thousand, one hundred eleven".