445908649 has 2 divisors, whose sum is σ = 445908650. Its totient is φ = 445908648.

The previous prime is 445908647. The next prime is 445908677. The reversal of 445908649 is 946809544.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 356265625 + 89643024 = 18875^2 + 9468^2 .

It is a cyclic number.

It is not a de Polignac number, because 445908649 - 2¹ = 445908647 is a prime.

Together with 445908647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (445908647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222954324 + 222954325.

It is an arithmetic number, because the mean of its divisors is an integer number (222954325).

Almost surely, 2^445908649 is an apocalyptic number.

It is an amenable number.

445908649 is a deficient number, since it is larger than the sum of its proper divisors (1).

445908649 is an equidigital number, since it uses as much as digits as its factorization.

445908649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The square root of 445908649 is about 21116.5491735747. The cubic root of 445908649 is about 763.9799576488.

The spelling of 445908649 in words is "four hundred forty-five million, nine hundred eight thousand, six hundred forty-nine".