445621669 has 2 divisors, whose sum is σ = 445621670. Its totient is φ = 445621668.

The previous prime is 445621639. The next prime is 445621679. The reversal of 445621669 is 966126544.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 444788100 + 833569 = 21090^2 + 913^2 .

It is a cyclic number.

It is not a de Polignac number, because 445621669 - 2¹⁵ = 445588901 is a prime.

It is a super-2 number, since 2×445621669² = 397157343764691122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (445621639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222810834 + 222810835.

It is an arithmetic number, because the mean of its divisors is an integer number (222810835).

Almost surely, 2^445621669 is an apocalyptic number.

It is an amenable number.

445621669 is a deficient number, since it is larger than the sum of its proper divisors (1).

445621669 is an equidigital number, since it uses as much as digits as its factorization.

445621669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 43.

The square root of 445621669 is about 21109.7529355509. The cubic root of 445621669 is about 763.8160271964.

The spelling of 445621669 in words is "four hundred forty-five million, six hundred twenty-one thousand, six hundred sixty-nine".