674442521 has 2 divisors, whose sum is σ = 674442522. Its totient is φ = 674442520.

The previous prime is 674442493. The next prime is 674442529. The reversal of 674442521 is 125244476.

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., 370986121 + 303456400 = 19261^2 + 17420^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-674442521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (674442529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 337221260 + 337221261.

It is an arithmetic number, because the mean of its divisors is an integer number (337221261).

Almost surely, 2^674442521 is an apocalyptic number.

It is an amenable number.

674442521 is a deficient number, since it is larger than the sum of its proper divisors (1).

674442521 is an equidigital number, since it uses as much as digits as its factorization.

674442521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 35.

The square root of 674442521 is about 25970.0312090687. The cubic root of 674442521 is about 876.9637618419.

Adding to 674442521 its reverse (125244476), we get a palindrome (799686997).

The spelling of 674442521 in words is "six hundred seventy-four million, four hundred forty-two thousand, five hundred twenty-one".