1321762513 has 4 divisors (see below), whose sum is σ = 1322789220. Its totient is φ = 1320735808.

The previous prime is 1321762511. The next prime is 1321762517. The reversal of 1321762513 is 3152671231.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 656999424 + 664763089 = 25632^2 + 25783^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321762513 - 2¹ = 1321762511 is a prime.

It is a super-2 number, since 2×1321762513² = 3494112281544150338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321762511) 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 in 3 ways as a sum of consecutive naturals, for example, 511420 + ... + 513997.

It is an arithmetic number, because the mean of its divisors is an integer number (330697305).

Almost surely, 2^1321762513 is an apocalyptic number.

It is an amenable number.

1321762513 is a deficient number, since it is larger than the sum of its proper divisors (1026707).

1321762513 is a wasteful number, since it uses less digits than its factorization.

1321762513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026706.

The product of its digits is 7560, while the sum is 31.

The square root of 1321762513 is about 36356.0519446213. The cubic root of 1321762513 is about 1097.4493278321.

It can be divided in two parts, 132176 and 2513, that added together give a square (134689 = 367²).

The spelling of 1321762513 in words is "one billion, three hundred twenty-one million, seven hundred sixty-two thousand, five hundred thirteen".