687323297 has 2 divisors, whose sum is σ = 687323298. Its totient is φ = 687323296.

The previous prime is 687323269. The next prime is 687323323. The reversal of 687323297 is 792323786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 421111441 + 266211856 = 20521^2 + 16316^2 .

It is a cyclic number.

It is not a de Polignac number, because 687323297 - 2¹² = 687319201 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (687323257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343661648 + 343661649.

It is an arithmetic number, because the mean of its divisors is an integer number (343661649).

Almost surely, 2^687323297 is an apocalyptic number.

It is an amenable number.

687323297 is a deficient number, since it is larger than the sum of its proper divisors (1).

687323297 is an equidigital number, since it uses as much as digits as its factorization.

687323297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 47.

The square root of 687323297 is about 26216.8513937124. The cubic root of 687323297 is about 882.5114624261.

The spelling of 687323297 in words is "six hundred eighty-seven million, three hundred twenty-three thousand, two hundred ninety-seven".