680993947 has 2 divisors, whose sum is σ = 680993948. Its totient is φ = 680993946.

The previous prime is 680993909. The next prime is 680993987. The reversal of 680993947 is 749399086.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 680993947 - 2¹⁵ = 680961179 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (680993987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340496973 + 340496974.

It is an arithmetic number, because the mean of its divisors is an integer number (340496974).

Almost surely, 2^680993947 is an apocalyptic number.

680993947 is a deficient number, since it is larger than the sum of its proper divisors (1).

680993947 is an equidigital number, since it uses as much as digits as its factorization.

680993947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The square root of 680993947 is about 26095.8607254101. The cubic root of 680993947 is about 879.7941783624.

The spelling of 680993947 in words is "six hundred eighty million, nine hundred ninety-three thousand, nine hundred forty-seven".