1321515103 has 2 divisors, whose sum is σ = 1321515104. Its totient is φ = 1321515102.

The previous prime is 1321515067. The next prime is 1321515133. The reversal of 1321515103 is 3015151231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1321515103 - 2²¹ = 1319417951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321515133) 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 as a sum of consecutive naturals, namely, 660757551 + 660757552.

It is an arithmetic number, because the mean of its divisors is an integer number (660757552).

Almost surely, 2^1321515103 is an apocalyptic number.

1321515103 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321515103 is an equidigital number, since it uses as much as digits as its factorization.

1321515103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 1321515103 is about 36352.6491881953. The cubic root of 1321515103 is about 1097.3808493476.

Adding to 1321515103 its reverse (3015151231), we get a palindrome (4336666334).

The spelling of 1321515103 in words is "one billion, three hundred twenty-one million, five hundred fifteen thousand, one hundred three".