1321075517 has 2 divisors, whose sum is σ = 1321075518. Its totient is φ = 1321075516.

The previous prime is 1321075507. The next prime is 1321075523. The reversal of 1321075517 is 7155701231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1295208121 + 25867396 = 35989^2 + 5086^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321075517 - 2¹⁴ = 1321059133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321075507) 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, 660537758 + 660537759.

It is an arithmetic number, because the mean of its divisors is an integer number (660537759).

Almost surely, 2^1321075517 is an apocalyptic number.

It is an amenable number.

1321075517 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321075517 is an equidigital number, since it uses as much as digits as its factorization.

1321075517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7350, while the sum is 32.

The square root of 1321075517 is about 36346.6025509951. The cubic root of 1321075517 is about 1097.2591590357.

Adding to 1321075517 its reverse (7155701231), we get a palindrome (8476776748).

The spelling of 1321075517 in words is "one billion, three hundred twenty-one million, seventy-five thousand, five hundred seventeen".