674945221 has 2 divisors, whose sum is σ = 674945222. Its totient is φ = 674945220.

The previous prime is 674945213. The next prime is 674945233. The reversal of 674945221 is 122549476.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 602457025 + 72488196 = 24545^2 + 8514^2 .

It is a cyclic number.

It is not a de Polignac number, because 674945221 - 2³ = 674945213 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 (674943221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 337472610 + 337472611.

It is an arithmetic number, because the mean of its divisors is an integer number (337472611).

Almost surely, 2^674945221 is an apocalyptic number.

It is an amenable number.

674945221 is a deficient number, since it is larger than the sum of its proper divisors (1).

674945221 is an equidigital number, since it uses as much as digits as its factorization.

674945221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 674945221 is about 25979.7078697972. The cubic root of 674945221 is about 877.1815912267.

The spelling of 674945221 in words is "six hundred seventy-four million, nine hundred forty-five thousand, two hundred twenty-one".