674649191 has 2 divisors, whose sum is σ = 674649192. Its totient is φ = 674649190.

The previous prime is 674649163. The next prime is 674649229. The reversal of 674649191 is 191946476.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 674649191 - 2¹⁸ = 674387047 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 (674649121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 337324595 + 337324596.

It is an arithmetic number, because the mean of its divisors is an integer number (337324596).

Almost surely, 2^674649191 is an apocalyptic number.

674649191 is a deficient number, since it is larger than the sum of its proper divisors (1).

674649191 is an equidigital number, since it uses as much as digits as its factorization.

674649191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 47.

The square root of 674649191 is about 25974.0099137580. The cubic root of 674649191 is about 877.0533289463.

The spelling of 674649191 in words is "six hundred seventy-four million, six hundred forty-nine thousand, one hundred ninety-one".