718391 has 2 divisors, whose sum is σ = 718392. Its totient is φ = 718390.

The previous prime is 718387. The next prime is 718411. The reversal of 718391 is 193817.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 718391 - 2² = 718387 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (718321) 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, 359195 + 359196.

It is an arithmetic number, because the mean of its divisors is an integer number (359196).

2⁷¹⁸³⁹¹ is an apocalyptic number.

718391 is a deficient number, since it is larger than the sum of its proper divisors (1).

718391 is an equidigital number, since it uses as much as digits as its factorization.

718391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 29.

The square root of 718391 is about 847.5794947968. The cubic root of 718391 is about 89.5612805040.

The spelling of 718391 in words is "seven hundred eighteen thousand, three hundred ninety-one".