445445221409 has 2 divisors, whose sum is σ = 445445221410. Its totient is φ = 445445221408.

The previous prime is 445445221399. The next prime is 445445221423. The reversal of 445445221409 is 904122544544.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 445389390625 + 55830784 = 667375^2 + 7472^2 .

It is a cyclic number.

It is not a de Polignac number, because 445445221409 - 2⁸ = 445445221153 is a prime.

It is a super-2 number, since 2×445445221409² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 445445221409.

It is not a weakly prime, because it can be changed into another prime (445445221009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222722610704 + 222722610705.

It is an arithmetic number, because the mean of its divisors is an integer number (222722610705).

Almost surely, 2^445445221409 is an apocalyptic number.

It is an amenable number.

445445221409 is a deficient number, since it is larger than the sum of its proper divisors (1).

445445221409 is an equidigital number, since it uses as much as digits as its factorization.

445445221409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 921600, while the sum is 44.

The spelling of 445445221409 in words is "four hundred forty-five billion, four hundred forty-five million, two hundred twenty-one thousand, four hundred nine".