1321513 has 2 divisors, whose sum is σ = 1321514. Its totient is φ = 1321512.

The previous prime is 1321487. The next prime is 1321517. The reversal of 1321513 is 3151231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 700569 + 620944 = 837^2 + 788^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321513 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660756 + 660757.

It is an arithmetic number, because the mean of its divisors is an integer number (660757).

2^1321513 is an apocalyptic number.

It is an amenable number.

1321513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321513 is an equidigital number, since it uses as much as digits as its factorization.

1321513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90, while the sum is 16.

The square root of 1321513 is about 1149.5707894688. The cubic root of 1321513 is about 109.7380267240.

Adding to 1321513 its reverse (3151231), we get a palindrome (4472744).

The spelling of 1321513 in words is "one million, three hundred twenty-one thousand, five hundred thirteen".