1321316503 has 8 divisors (see below), whose sum is σ = 1468858496. Its totient is φ = 1180332000.

The previous prime is 1321316501. The next prime is 1321316527. The reversal of 1321316503 is 3056131231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321316503 - 2¹ = 1321316501 is a prime.

It is a super-2 number, since 2×1321316503² = 3491754602200298018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321316501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1638948 + ... + 1639753.

It is an arithmetic number, because the mean of its divisors is an integer number (183607312).

Almost surely, 2^1321316503 is an apocalyptic number.

1321316503 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1321316503 is a deficient number, since it is larger than the sum of its proper divisors (147541993).

1321316503 is a wasteful number, since it uses less digits than its factorization.

1321316503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3278745.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 1321316503 is about 36349.9175102228. The cubic root of 1321316503 is about 1097.3258743787.

Adding to 1321316503 its reverse (3056131231), we get a palindrome (4377447734).

The spelling of 1321316503 in words is "one billion, three hundred twenty-one million, three hundred sixteen thousand, five hundred three".