628641191 has 2 divisors, whose sum is σ = 628641192. Its totient is φ = 628641190.

The previous prime is 628641161. The next prime is 628641197. The reversal of 628641191 is 191146826.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 628641191 - 2¹⁴ = 628624807 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 (628641197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314320595 + 314320596.

It is an arithmetic number, because the mean of its divisors is an integer number (314320596).

Almost surely, 2^628641191 is an apocalyptic number.

628641191 is a deficient number, since it is larger than the sum of its proper divisors (1).

628641191 is an equidigital number, since it uses as much as digits as its factorization.

628641191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 628641191 is about 25072.7180616701. The cubic root of 628641191 is about 856.6451191082.

The spelling of 628641191 in words is "six hundred twenty-eight million, six hundred forty-one thousand, one hundred ninety-one".