745005421 has 2 divisors, whose sum is σ = 745005422. Its totient is φ = 745005420.

The previous prime is 745005419. The next prime is 745005451. The reversal of 745005421 is 124500547.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 596043396 + 148962025 = 24414^2 + 12205^2 .

It is an emirp because it is prime and its reverse (124500547) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 745005421 - 2¹ = 745005419 is a prime.

Together with 745005419, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 745005421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (745005451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372502710 + 372502711.

It is an arithmetic number, because the mean of its divisors is an integer number (372502711).

Almost surely, 2^745005421 is an apocalyptic number.

It is an amenable number.

745005421 is a deficient number, since it is larger than the sum of its proper divisors (1).

745005421 is an equidigital number, since it uses as much as digits as its factorization.

745005421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5600, while the sum is 28.

The square root of 745005421 is about 27294.7874327682. The cubic root of 745005421 is about 906.5389689286.

Adding to 745005421 its reverse (124500547), we get a palindrome (869505968).

The spelling of 745005421 in words is "seven hundred forty-five million, five thousand, four hundred twenty-one".