421544077 has 2 divisors, whose sum is σ = 421544078. Its totient is φ = 421544076.

The previous prime is 421544063. The next prime is 421544141. The reversal of 421544077 is 770445124.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 342583081 + 78960996 = 18509^2 + 8886^2 .

It is a cyclic number.

It is not a de Polignac number, because 421544077 - 2¹⁹ = 421019789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421544047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210772038 + 210772039.

It is an arithmetic number, because the mean of its divisors is an integer number (210772039).

Almost surely, 2^421544077 is an apocalyptic number.

It is an amenable number.

421544077 is a deficient number, since it is larger than the sum of its proper divisors (1).

421544077 is an equidigital number, since it uses as much as digits as its factorization.

421544077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31360, while the sum is 34.

The square root of 421544077 is about 20531.5385931011. The cubic root of 421544077 is about 749.8038461842.

The spelling of 421544077 in words is "four hundred twenty-one million, five hundred forty-four thousand, seventy-seven".