421569977 has 2 divisors, whose sum is σ = 421569978. Its totient is φ = 421569976.

The previous prime is 421569959. The next prime is 421569983. The reversal of 421569977 is 779965124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 349727401 + 71842576 = 18701^2 + 8476^2 .

It is a cyclic number.

It is not a de Polignac number, because 421569977 - 2¹⁶ = 421504441 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (421569917) 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, 210784988 + 210784989.

It is an arithmetic number, because the mean of its divisors is an integer number (210784989).

Almost surely, 2^421569977 is an apocalyptic number.

It is an amenable number.

421569977 is a deficient number, since it is larger than the sum of its proper divisors (1).

421569977 is an equidigital number, since it uses as much as digits as its factorization.

421569977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 50.

The square root of 421569977 is about 20532.1693203616. The cubic root of 421569977 is about 749.8192020493.

The spelling of 421569977 in words is "four hundred twenty-one million, five hundred sixty-nine thousand, nine hundred seventy-seven".