1687316723 has 2 divisors, whose sum is σ = 1687316724. Its totient is φ = 1687316722.

The previous prime is 1687316699. The next prime is 1687316767. The reversal of 1687316723 is 3276137861.

It is an a-pointer prime, because the next prime (1687316767) can be obtained adding 1687316723 to its sum of digits (44).

It is a weak prime.

It is an emirp because it is prime and its reverse (3276137861) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1687316723 is a prime.

It is not a weakly prime, because it can be changed into another prime (1687316123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843658361 + 843658362.

It is an arithmetic number, because the mean of its divisors is an integer number (843658362).

Almost surely, 2^1687316723 is an apocalyptic number.

1687316723 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687316723 is an equidigital number, since it uses as much as digits as its factorization.

1687316723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 44.

The square root of 1687316723 is about 41076.9609757100. The cubic root of 1687316723 is about 1190.5076860671.

The spelling of 1687316723 in words is "one billion, six hundred eighty-seven million, three hundred sixteen thousand, seven hundred twenty-three".