445345421 has 2 divisors, whose sum is σ = 445345422. Its totient is φ = 445345420.

The previous prime is 445345339. The next prime is 445345457. The reversal of 445345421 is 124543544.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320911396 + 124434025 = 17914^2 + 11155^2 .

It is a cyclic number.

It is not a de Polignac number, because 445345421 - 2¹⁸ = 445083277 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (445345471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222672710 + 222672711.

It is an arithmetic number, because the mean of its divisors is an integer number (222672711).

Almost surely, 2^445345421 is an apocalyptic number.

It is an amenable number.

445345421 is a deficient number, since it is larger than the sum of its proper divisors (1).

445345421 is an equidigital number, since it uses as much as digits as its factorization.

445345421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38400, while the sum is 32.

The square root of 445345421 is about 21103.2087844479. The cubic root of 445345421 is about 763.6581606466.

Adding to 445345421 its reverse (124543544), we get a palindrome (569888965).

The spelling of 445345421 in words is "four hundred forty-five million, three hundred forty-five thousand, four hundred twenty-one".