674956621 has 2 divisors, whose sum is σ = 674956622. Its totient is φ = 674956620.

The previous prime is 674956619. The next prime is 674956651. The reversal of 674956621 is 126659476.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 396567396 + 278389225 = 19914^2 + 16685^2 .

It is a cyclic number.

It is not a de Polignac number, because 674956621 - 2¹ = 674956619 is a prime.

Together with 674956619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (674956651) 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, 337478310 + 337478311.

It is an arithmetic number, because the mean of its divisors is an integer number (337478311).

Almost surely, 2^674956621 is an apocalyptic number.

It is an amenable number.

674956621 is a deficient number, since it is larger than the sum of its proper divisors (1).

674956621 is an equidigital number, since it uses as much as digits as its factorization.

674956621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 46.

The square root of 674956621 is about 25979.9272708759. The cubic root of 674956621 is about 877.1865298072.

The spelling of 674956621 in words is "six hundred seventy-four million, nine hundred fifty-six thousand, six hundred twenty-one".