718381 has 2 divisors, whose sum is σ = 718382. Its totient is φ = 718380.

The previous prime is 718379. The next prime is 718387. The reversal of 718381 is 183817.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 714025 + 4356 = 845^2 + 66^2 .

It is a cyclic number.

It is not a de Polignac number, because 718381 - 2¹ = 718379 is a prime.

It is a super-2 number, since 2×718381² = 1032142522322, which contains 22 as substring.

Together with 718379, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (718387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359190 + 359191.

It is an arithmetic number, because the mean of its divisors is an integer number (359191).

2⁷¹⁸³⁸¹ is an apocalyptic number.

It is an amenable number.

718381 is a deficient number, since it is larger than the sum of its proper divisors (1).

718381 is an equidigital number, since it uses as much as digits as its factorization.

718381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 28.

The square root of 718381 is about 847.5735956246. The cubic root of 718381 is about 89.5608649379.

The spelling of 718381 in words is "seven hundred eighteen thousand, three hundred eighty-one".