445513021 has 2 divisors, whose sum is σ = 445513022. Its totient is φ = 445513020.

The previous prime is 445512983. The next prime is 445513027. The reversal of 445513021 is 120315544.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 404412100 + 41100921 = 20110^2 + 6411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-445513021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (445513027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222756510 + 222756511.

It is an arithmetic number, because the mean of its divisors is an integer number (222756511).

Almost surely, 2^445513021 is an apocalyptic number.

It is an amenable number.

445513021 is a deficient number, since it is larger than the sum of its proper divisors (1).

445513021 is an equidigital number, since it uses as much as digits as its factorization.

445513021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 445513021 is about 21107.1793710102. The cubic root of 445513021 is about 763.7539462618.

Adding to 445513021 its reverse (120315544), we get a palindrome (565828565).

The spelling of 445513021 in words is "four hundred forty-five million, five hundred thirteen thousand, twenty-one".