680242091 has 2 divisors, whose sum is σ = 680242092. Its totient is φ = 680242090.

The previous prime is 680242081. The next prime is 680242103. The reversal of 680242091 is 190242086.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680242091 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (680242001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340121045 + 340121046.

It is an arithmetic number, because the mean of its divisors is an integer number (340121046).

Almost surely, 2^680242091 is an apocalyptic number.

680242091 is a deficient number, since it is larger than the sum of its proper divisors (1).

680242091 is an equidigital number, since it uses as much as digits as its factorization.

680242091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 680242091 is about 26081.4510907656. The cubic root of 680242091 is about 879.4702782158.

The spelling of 680242091 in words is "six hundred eighty million, two hundred forty-two thousand, ninety-one".