1331513 has 2 divisors, whose sum is σ = 1331514. Its totient is φ = 1331512.

The previous prime is 1331497. The next prime is 1331521. The reversal of 1331513 is 3151331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1149184 + 182329 = 1072^2 + 427^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331513 - 2⁴ = 1331497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1331491 and 1331500.

It is not a weakly prime, because it can be changed into another prime (1331573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665756 + 665757.

It is an arithmetic number, because the mean of its divisors is an integer number (665757).

2^1331513 is an apocalyptic number.

It is an amenable number.

1331513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331513 is an equidigital number, since it uses as much as digits as its factorization.

1331513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 135, while the sum is 17.

The square root of 1331513 is about 1153.9120417086. The cubic root of 1331513 is about 110.0141304162.

Adding to 1331513 its reverse (3151331), we get a palindrome (4482844).

The spelling of 1331513 in words is "one million, three hundred thirty-one thousand, five hundred thirteen".