812491 has 2 divisors, whose sum is σ = 812492. Its totient is φ = 812490.

The previous prime is 812477. The next prime is 812501. The reversal of 812491 is 194218.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 812491 - 2⁷ = 812363 is a prime.

It is not a weakly prime, because it can be changed into another prime (812401) 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, 406245 + 406246.

It is an arithmetic number, because the mean of its divisors is an integer number (406246).

2⁸¹²⁴⁹¹ is an apocalyptic number.

812491 is a deficient number, since it is larger than the sum of its proper divisors (1).

812491 is an equidigital number, since it uses as much as digits as its factorization.

812491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 25.

The square root of 812491 is about 901.3828265504. The cubic root of 812491 is about 93.3124343797.

The spelling of 812491 in words is "eight hundred twelve thousand, four hundred ninety-one".