687712043 has 2 divisors, whose sum is σ = 687712044. Its totient is φ = 687712042.

The previous prime is 687712009. The next prime is 687712063. The reversal of 687712043 is 340217786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 687712043 - 2⁶ = 687711979 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 687711988 and 687712006.

It is not a weakly prime, because it can be changed into another prime (687712063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343856021 + 343856022.

It is an arithmetic number, because the mean of its divisors is an integer number (343856022).

Almost surely, 2^687712043 is an apocalyptic number.

687712043 is a deficient number, since it is larger than the sum of its proper divisors (1).

687712043 is an equidigital number, since it uses as much as digits as its factorization.

687712043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 687712043 is about 26224.2643938777. The cubic root of 687712043 is about 882.6778121593.

The spelling of 687712043 in words is "six hundred eighty-seven million, seven hundred twelve thousand, forty-three".