680289191 has 2 divisors, whose sum is σ = 680289192. Its totient is φ = 680289190.

The previous prime is 680289161. The next prime is 680289217. The reversal of 680289191 is 191982086.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680289191 is a prime.

It is a Sophie Germain 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 (680289121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340144595 + 340144596.

It is an arithmetic number, because the mean of its divisors is an integer number (340144596).

Almost surely, 2^680289191 is an apocalyptic number.

680289191 is a deficient number, since it is larger than the sum of its proper divisors (1).

680289191 is an equidigital number, since it uses as much as digits as its factorization.

680289191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 680289191 is about 26082.3540156942. The cubic root of 680289191 is about 879.4905759376.

The spelling of 680289191 in words is "six hundred eighty million, two hundred eighty-nine thousand, one hundred ninety-one".