1321557113 has 2 divisors, whose sum is σ = 1321557114. Its totient is φ = 1321557112.

The previous prime is 1321557073. The next prime is 1321557121. The reversal of 1321557113 is 3117551231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1206381289 + 115175824 = 34733^2 + 10732^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321557113 - 2¹² = 1321553017 is a prime.

It is not a weakly prime, because it can be changed into another prime (1323557113) 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, 660778556 + 660778557.

It is an arithmetic number, because the mean of its divisors is an integer number (660778557).

Almost surely, 2^1321557113 is an apocalyptic number.

It is an amenable number.

1321557113 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321557113 is an equidigital number, since it uses as much as digits as its factorization.

1321557113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3150, while the sum is 29.

The square root of 1321557113 is about 36353.2269956877. The cubic root of 1321557113 is about 1097.3924775363.

The spelling of 1321557113 in words is "one billion, three hundred twenty-one million, five hundred fifty-seven thousand, one hundred thirteen".