420442031 has 2 divisors, whose sum is σ = 420442032. Its totient is φ = 420442030.

The previous prime is 420442027. The next prime is 420442067. The reversal of 420442031 is 130244024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420442031 - 2² = 420442027 is a prime.

It is a super-2 number, since 2×420442031² = 353543002862809922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 420441994 and 420442012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420447031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210221015 + 210221016.

It is an arithmetic number, because the mean of its divisors is an integer number (210221016).

Almost surely, 2^420442031 is an apocalyptic number.

420442031 is a deficient number, since it is larger than the sum of its proper divisors (1).

420442031 is an equidigital number, since it uses as much as digits as its factorization.

420442031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 420442031 is about 20504.6831480030. The cubic root of 420442031 is about 749.1498699211.

Adding to 420442031 its reverse (130244024), we get a palindrome (550686055).

The spelling of 420442031 in words is "four hundred twenty million, four hundred forty-two thousand, thirty-one".