718691 has 2 divisors, whose sum is σ = 718692. Its totient is φ = 718690.

The previous prime is 718661. The next prime is 718703. The reversal of 718691 is 196817.

It is a strong prime.

It is an emirp because it is prime and its reverse (196817) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 718691 - 2¹⁰ = 717667 is a prime.

It is a Chen prime.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 718691.

It is not a weakly prime, because it can be changed into another prime (718621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359345 + 359346.

It is an arithmetic number, because the mean of its divisors is an integer number (359346).

2⁷¹⁸⁶⁹¹ is an apocalyptic number.

718691 is a deficient number, since it is larger than the sum of its proper divisors (1).

718691 is an equidigital number, since it uses as much as digits as its factorization.

718691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 32.

The square root of 718691 is about 847.7564508749. The cubic root of 718691 is about 89.5737456959.

The spelling of 718691 in words is "seven hundred eighteen thousand, six hundred ninety-one".