420440131 has 2 divisors, whose sum is σ = 420440132. Its totient is φ = 420440130.

The previous prime is 420440123. The next prime is 420440179. The reversal of 420440131 is 131044024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420440131 - 2³ = 420440123 is a prime.

It is a super-2 number, since 2×420440131² = 353539807510594322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 420440099 and 420440108.

It is not a weakly prime, because it can be changed into another prime (420440101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210220065 + 210220066.

It is an arithmetic number, because the mean of its divisors is an integer number (210220066).

Almost surely, 2^420440131 is an apocalyptic number.

420440131 is a deficient number, since it is larger than the sum of its proper divisors (1).

420440131 is an equidigital number, since it uses as much as digits as its factorization.

420440131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 420440131 is about 20504.6368170714. The cubic root of 420440131 is about 749.1487414366.

Adding to 420440131 its reverse (131044024), we get a palindrome (551484155).

The spelling of 420440131 in words is "four hundred twenty million, four hundred forty thousand, one hundred thirty-one".