1215231503 has 4 divisors (see below), whose sum is σ = 1215301368. Its totient is φ = 1215161640.

The previous prime is 1215231491. The next prime is 1215231551. The reversal of 1215231503 is 3051325121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1215231503 - 2⁴ = 1215231487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215231593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14108 + ... + 51278.

It is an arithmetic number, because the mean of its divisors is an integer number (303825342).

Almost surely, 2^1215231503 is an apocalyptic number.

1215231503 is a deficient number, since it is larger than the sum of its proper divisors (69865).

1215231503 is an equidigital number, since it uses as much as digits as its factorization.

1215231503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69864.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 1215231503 is about 34860.1707253421. The cubic root of 1215231503 is about 1067.1357591806.

Adding to 1215231503 its reverse (3051325121), we get a palindrome (4266556624).

The spelling of 1215231503 in words is "one billion, two hundred fifteen million, two hundred thirty-one thousand, five hundred three".