814991 has 2 divisors, whose sum is σ = 814992. Its totient is φ = 814990.

The previous prime is 814949. The next prime is 815029. The reversal of 814991 is 199418.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 814991 - 2⁶ = 814927 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a plaindrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (814901) 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, 407495 + 407496.

It is an arithmetic number, because the mean of its divisors is an integer number (407496).

2⁸¹⁴⁹⁹¹ is an apocalyptic number.

814991 is a deficient number, since it is larger than the sum of its proper divisors (1).

814991 is an equidigital number, since it uses as much as digits as its factorization.

814991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 32.

The square root of 814991 is about 902.7685196106. The cubic root of 814991 is about 93.4080425069.

The spelling of 814991 in words is "eight hundred fourteen thousand, nine hundred ninety-one".