1321513069 has 4 divisors (see below), whose sum is σ = 1321622460. Its totient is φ = 1321403680.

The previous prime is 1321513049. The next prime is 1321513073. The reversal of 1321513069 is 9603151231.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9603151231 = 467 ⋅20563493.

It can be written as a sum of positive squares in 2 ways, for example, as 358155625 + 963357444 = 18925^2 + 31038^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321513069 - 2¹⁵ = 1321480301 is a prime.

It is a super-2 number, since 2×1321513069² = 3492793583075597522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321513069.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321513019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33952 + ... + 61609.

It is an arithmetic number, because the mean of its divisors is an integer number (330405615).

Almost surely, 2^1321513069 is an apocalyptic number.

It is an amenable number.

1321513069 is a deficient number, since it is larger than the sum of its proper divisors (109391).

1321513069 is an equidigital number, since it uses as much as digits as its factorization.

1321513069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109390.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 1321513069 is about 36352.6212122317. The cubic root of 1321513069 is about 1097.3802863388.

The spelling of 1321513069 in words is "one billion, three hundred twenty-one million, five hundred thirteen thousand, sixty-nine".