1321503530531 has 4 divisors (see below), whose sum is σ = 1321516022112. Its totient is φ = 1321491038952.

The previous prime is 1321503530527. The next prime is 1321503530551. The reversal of 1321503530531 is 1350353051231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1321503530531 - 2² = 1321503530527 is a prime.

It is a super-2 number, since 2×1321503530531² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321503530551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6085736 + ... + 6299141.

It is an arithmetic number, because the mean of its divisors is an integer number (330379005528).

Almost surely, 2^{1321503530531} is an apocalyptic number.

1321503530531 is a deficient number, since it is larger than the sum of its proper divisors (12491581).

1321503530531 is a wasteful number, since it uses less digits than its factorization.

1321503530531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12491580.

The product of its (nonzero) digits is 20250, while the sum is 32.

Adding to 1321503530531 its reverse (1350353051231), we get a palindrome (2671856581762).

The spelling of 1321503530531 in words is "one trillion, three hundred twenty-one billion, five hundred three million, five hundred thirty thousand, five hundred thirty-one".