420031111 has 4 divisors (see below), whose sum is σ = 422207632. Its totient is φ = 417854592.

The previous prime is 420031109. The next prime is 420031153. The reversal of 420031111 is 111130024.

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

It is a cyclic number.

It is not a de Polignac number, because 420031111 - 2¹ = 420031109 is a prime.

It is a super-2 number, since 2×420031111² = 352852268415788642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 420031091 and 420031100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420031411) 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, 1087971 + ... + 1088356.

It is an arithmetic number, because the mean of its divisors is an integer number (105551908).

Almost surely, 2^420031111 is an apocalyptic number.

420031111 is a deficient number, since it is larger than the sum of its proper divisors (2176521).

420031111 is a wasteful number, since it uses less digits than its factorization.

420031111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2176520.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 420031111 is about 20494.6605485429. The cubic root of 420031111 is about 748.9057292422.

Adding to 420031111 its reverse (111130024), we get a palindrome (531161135).

The spelling of 420031111 in words is "four hundred twenty million, thirty-one thousand, one hundred eleven".