Cookie Consent by
Search a number
814381 is a prime number

814381 has 2 divisors, whose sum is σ = 814382. Its totient is φ = 814380.

The previous prime is 814379. The next prime is 814393. The reversal of 814381 is 183418.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 538756 + 275625 = 734^2 + 525^2 .

It is a cyclic number.

It is not a de Polignac number, because 814381 - 21 = 814379 is a prime.

It is a super-2 number, since 2×8143812 = 1326432826322, which contains 22 as substring.

Together with 814379, it forms a pair of twin primes.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

814381 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (814081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407190 + 407191.

It is an arithmetic number, because the mean of its divisors is an integer number (407191).

2814381 is an apocalyptic number.

It is an amenable number.

814381 is a deficient number, since it is larger than the sum of its proper divisors (1).

814381 is an equidigital number, since it uses as much as digits as its factorization.

814381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 25.

The square root of 814381 is about 902.4306067505. The cubic root of 814381 is about 93.3847321769.

Adding to 814381 its reverse (183418), we get a palindrome (997799).

The spelling of 814381 in words is "eight hundred fourteen thousand, three hundred eighty-one".