421556041 has 2 divisors, whose sum is σ = 421556042. Its totient is φ = 421556040.

The previous prime is 421556033. The next prime is 421556063. The reversal of 421556041 is 140655124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 313998400 + 107557641 = 17720^2 + 10371^2 .

It is a cyclic number.

It is not a de Polignac number, because 421556041 - 2³ = 421556033 is a prime.

It is not a weakly prime, because it can be changed into another prime (421556071) 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, 210778020 + 210778021.

It is an arithmetic number, because the mean of its divisors is an integer number (210778021).

Almost surely, 2^421556041 is an apocalyptic number.

It is an amenable number.

421556041 is a deficient number, since it is larger than the sum of its proper divisors (1).

421556041 is an equidigital number, since it uses as much as digits as its factorization.

421556041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 421556041 is about 20531.8299476691. The cubic root of 421556041 is about 749.8109396048.

The spelling of 421556041 in words is "four hundred twenty-one million, five hundred fifty-six thousand, forty-one".