1231003 has 2 divisors, whose sum is σ = 1231004. Its totient is φ = 1231002.

The previous prime is 1231001. The next prime is 1231039. The reversal of 1231003 is 3001321.

It is a weak prime.

It is an emirp because it is prime and its reverse (3001321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231003 - 2¹ = 1231001 is a prime.

Together with 1231001, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1231001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615501 + 615502.

It is an arithmetic number, because the mean of its divisors is an integer number (615502).

2^1231003 is an apocalyptic number.

1231003 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231003 is an equidigital number, since it uses as much as digits as its factorization.

1231003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 1231003 is about 1109.5057458166. The cubic root of 1231003 is about 107.1732425143.

Adding to 1231003 its reverse (3001321), we get a palindrome (4232324).

The spelling of 1231003 in words is "one million, two hundred thirty-one thousand, three".