812503 has 2 divisors, whose sum is σ = 812504. Its totient is φ = 812502.

The previous prime is 812501. The next prime is 812519. The reversal of 812503 is 305218.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 812503 - 2¹ = 812501 is a prime.

It is a super-2 number, since 2×812503² = 1320322250018, which contains 22 as substring.

Together with 812501, it forms a pair of twin primes.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406251 + 406252.

It is an arithmetic number, because the mean of its divisors is an integer number (406252).

2⁸¹²⁵⁰³ is an apocalyptic number.

812503 is a deficient number, since it is larger than the sum of its proper divisors (1).

812503 is an equidigital number, since it uses as much as digits as its factorization.

812503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 812503 is about 901.3894829650. The cubic root of 812503 is about 93.3128937668.

The spelling of 812503 in words is "eight hundred twelve thousand, five hundred three".