718851989 has 2 divisors, whose sum is σ = 718851990. Its totient is φ = 718851988.

The previous prime is 718851949. The next prime is 718852019. The reversal of 718851989 is 989158817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 482153764 + 236698225 = 21958^2 + 15385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-718851989 is a prime.

It is a super-3 number, since 3×718851989³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (718851949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359425994 + 359425995.

It is an arithmetic number, because the mean of its divisors is an integer number (359425995).

Almost surely, 2^718851989 is an apocalyptic number.

It is an amenable number.

718851989 is a deficient number, since it is larger than the sum of its proper divisors (1).

718851989 is an equidigital number, since it uses as much as digits as its factorization.

718851989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 56.

The square root of 718851989 is about 26811.4152740955. The cubic root of 718851989 is about 895.8043346161.

The spelling of 718851989 in words is "seven hundred eighteen million, eight hundred fifty-one thousand, nine hundred eighty-nine".