1231503 has 24 divisors (see below), whose sum is σ = 2037888. Its totient is φ = 647712.

The previous prime is 1231487. The next prime is 1231511. The reversal of 1231503 is 3051321.

1231503 = T₇₂ + T₇₃ + ... + T₁₉₇.

It is a happy number.

It is not a de Polignac number, because 1231503 - 2⁴ = 1231487 is a prime.

1231503 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231513) 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 in 23 ways as a sum of consecutive naturals, for example, 3376 + ... + 3722.

It is an arithmetic number, because the mean of its divisors is an integer number (84912).

2^1231503 is an apocalyptic number.

1231503 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1231503 is a deficient number, since it is larger than the sum of its proper divisors (806385).

1231503 is a wasteful number, since it uses less digits than its factorization.

1231503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 1231503 is about 1109.7310484978. The cubic root of 1231503 is about 107.1877508374.

Adding to 1231503 its reverse (3051321), we get a palindrome (4282824).

The spelling of 1231503 in words is "one million, two hundred thirty-one thousand, five hundred three".