718289381 has 2 divisors, whose sum is σ = 718289382. Its totient is φ = 718289380.

The previous prime is 718289347. The next prime is 718289401. The reversal of 718289381 is 183982817.

718289381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 508908481 + 209380900 = 22559^2 + 14470^2 .

It is an emirp because it is prime and its reverse (183982817) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 718289381 - 2⁶ = 718289317 is a prime.

It is a super-2 number, since 2×718289381² = 1031879269714726322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (718289581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359144690 + 359144691.

It is an arithmetic number, because the mean of its divisors is an integer number (359144691).

Almost surely, 2^718289381 is an apocalyptic number.

It is an amenable number.

718289381 is a deficient number, since it is larger than the sum of its proper divisors (1).

718289381 is an equidigital number, since it uses as much as digits as its factorization.

718289381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 47.

The square root of 718289381 is about 26800.9212714787. The cubic root of 718289381 is about 895.5705738275.

The spelling of 718289381 in words is "seven hundred eighteen million, two hundred eighty-nine thousand, three hundred eighty-one".