421677649 has 2 divisors, whose sum is σ = 421677650. Its totient is φ = 421677648.

The previous prime is 421677611. The next prime is 421677667. The reversal of 421677649 is 946776124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 413837649 + 7840000 = 20343^2 + 2800^2 .

It is a cyclic number.

It is not a de Polignac number, because 421677649 - 2¹¹ = 421675601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421677599 and 421677608.

It is not a weakly prime, because it can be changed into another prime (421677149) 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, 210838824 + 210838825.

It is an arithmetic number, because the mean of its divisors is an integer number (210838825).

Almost surely, 2^421677649 is an apocalyptic number.

It is an amenable number.

421677649 is a deficient number, since it is larger than the sum of its proper divisors (1).

421677649 is an equidigital number, since it uses as much as digits as its factorization.

421677649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 46.

The square root of 421677649 is about 20534.7911847187. The cubic root of 421677649 is about 749.8830330185.

The spelling of 421677649 in words is "four hundred twenty-one million, six hundred seventy-seven thousand, six hundred forty-nine".