687312943 has 2 divisors, whose sum is σ = 687312944. Its totient is φ = 687312942.

The previous prime is 687312931. The next prime is 687312949. The reversal of 687312943 is 349213786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 687312943 - 2²⁹ = 150442031 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 687312943.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687312949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343656471 + 343656472.

It is an arithmetic number, because the mean of its divisors is an integer number (343656472).

Almost surely, 2^687312943 is an apocalyptic number.

687312943 is a deficient number, since it is larger than the sum of its proper divisors (1).

687312943 is an equidigital number, since it uses as much as digits as its factorization.

687312943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 43.

The square root of 687312943 is about 26216.6539245572. The cubic root of 687312943 is about 882.5070309503.

The spelling of 687312943 in words is "six hundred eighty-seven million, three hundred twelve thousand, nine hundred forty-three".