680172947 has 2 divisors, whose sum is σ = 680172948. Its totient is φ = 680172946.

The previous prime is 680172943. The next prime is 680172959. The reversal of 680172947 is 749271086.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 680172947 - 2² = 680172943 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 680172898 and 680172907.

It is not a weakly prime, because it can be changed into another prime (680172943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340086473 + 340086474.

It is an arithmetic number, because the mean of its divisors is an integer number (340086474).

Almost surely, 2^680172947 is an apocalyptic number.

680172947 is a deficient number, since it is larger than the sum of its proper divisors (1).

680172947 is an equidigital number, since it uses as much as digits as its factorization.

680172947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 680172947 is about 26080.1255173360. The cubic root of 680172947 is about 879.4404789457.

The spelling of 680172947 in words is "six hundred eighty million, one hundred seventy-two thousand, nine hundred forty-seven".