1321531103 has 2 divisors, whose sum is σ = 1321531104. Its totient is φ = 1321531102.

The previous prime is 1321531093. The next prime is 1321531153. The reversal of 1321531103 is 3011351231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321531103 - 2¹⁰ = 1321530079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321531153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660765551 + 660765552.

It is an arithmetic number, because the mean of its divisors is an integer number (660765552).

Almost surely, 2^1321531103 is an apocalyptic number.

1321531103 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321531103 is an equidigital number, since it uses as much as digits as its factorization.

1321531103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 1321531103 is about 36352.8692540218. The cubic root of 1321531103 is about 1097.3852781084.

Adding to 1321531103 its reverse (3011351231), we get a palindrome (4332882334).

The spelling of 1321531103 in words is "one billion, three hundred twenty-one million, five hundred thirty-one thousand, one hundred three".