420031231 has 2 divisors, whose sum is σ = 420031232. Its totient is φ = 420031230.

The previous prime is 420031193. The next prime is 420031247. The reversal of 420031231 is 132130024.

It is a happy number.

It is an a-pointer prime, because the next prime (420031247) can be obtained adding 420031231 to its sum of digits (16).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 420031231 - 2¹⁵ = 419998463 is a prime.

It is a super-2 number, since 2×420031231² = 352852470030750722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420031531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210015615 + 210015616.

It is an arithmetic number, because the mean of its divisors is an integer number (210015616).

Almost surely, 2^420031231 is an apocalyptic number.

420031231 is a deficient number, since it is larger than the sum of its proper divisors (1).

420031231 is an equidigital number, since it uses as much as digits as its factorization.

420031231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 420031231 is about 20494.6634761345. The cubic root of 420031231 is about 748.9058005613.

Adding to 420031231 its reverse (132130024), we get a palindrome (552161255).

It can be divided in two parts, 42003 and 1231, that added together give a palindrome (43234).

The spelling of 420031231 in words is "four hundred twenty million, thirty-one thousand, two hundred thirty-one".