680817251 has 2 divisors, whose sum is σ = 680817252. Its totient is φ = 680817250.

The previous prime is 680817239. The next prime is 680817281. The reversal of 680817251 is 152718086.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 680817251 - 2¹⁴ = 680800867 is a prime.

It is not a weakly prime, because it can be changed into another prime (680817281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340408625 + 340408626.

It is an arithmetic number, because the mean of its divisors is an integer number (340408626).

Almost surely, 2^680817251 is an apocalyptic number.

680817251 is a deficient number, since it is larger than the sum of its proper divisors (1).

680817251 is an equidigital number, since it uses as much as digits as its factorization.

680817251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 38.

The square root of 680817251 is about 26092.4749880114. The cubic root of 680817251 is about 879.7180790275.

It can be divided in two parts, 68081 and 7251, that multiplied together give a triangular number (493655331 = T₃₁₄₂₁).

The spelling of 680817251 in words is "six hundred eighty million, eight hundred seventeen thousand, two hundred fifty-one".