420041861 has 2 divisors, whose sum is σ = 420041862. Its totient is φ = 420041860.

The previous prime is 420041857. The next prime is 420041983. The reversal of 420041861 is 168140024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 335585761 + 84456100 = 18319^2 + 9190^2 .

It is a cyclic number.

It is not a de Polignac number, because 420041861 - 2² = 420041857 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420041861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420041821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210020930 + 210020931.

It is an arithmetic number, because the mean of its divisors is an integer number (210020931).

Almost surely, 2^420041861 is an apocalyptic number.

It is an amenable number.

420041861 is a deficient number, since it is larger than the sum of its proper divisors (1).

420041861 is an equidigital number, since it uses as much as digits as its factorization.

420041861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 420041861 is about 20494.9228102962. The cubic root of 420041861 is about 748.9121181879.

Adding to 420041861 its reverse (168140024), we get a palindrome (588181885).

The spelling of 420041861 in words is "four hundred twenty million, forty-one thousand, eight hundred sixty-one".