420512111 has 4 divisors (see below), whose sum is σ = 420634800. Its totient is φ = 420389424.

The previous prime is 420512069. The next prime is 420512129. The reversal of 420512111 is 111215024.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420512111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 420512111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420511111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56051 + ... + 63108.

It is an arithmetic number, because the mean of its divisors is an integer number (105158700).

Almost surely, 2^420512111 is an apocalyptic number.

420512111 is a deficient number, since it is larger than the sum of its proper divisors (122689).

420512111 is a wasteful number, since it uses less digits than its factorization.

420512111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122688.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 420512111 is about 20506.3919547052. The cubic root of 420512111 is about 749.1914908044.

Adding to 420512111 its reverse (111215024), we get a palindrome (531727135).

The spelling of 420512111 in words is "four hundred twenty million, five hundred twelve thousand, one hundred eleven".