1321297919 has 8 divisors (see below), whose sum is σ = 1399645008. Its totient is φ = 1243020160.

The previous prime is 1321297907. The next prime is 1321297921. The reversal of 1321297919 is 9197921231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321297919 is a prime.

It is a super-2 number, since 2×1321297919² = 3491656381507461122, 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 1321297919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321297519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24869 + ... + 57105.

It is an arithmetic number, because the mean of its divisors is an integer number (174955626).

Almost surely, 2^1321297919 is an apocalyptic number.

1321297919 is a deficient number, since it is larger than the sum of its proper divisors (78347089).

1321297919 is a wasteful number, since it uses less digits than its factorization.

1321297919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34665.

The product of its digits is 61236, while the sum is 44.

The square root of 1321297919 is about 36349.6618828841. The cubic root of 1321297919 is about 1097.3207298127.

The spelling of 1321297919 in words is "one billion, three hundred twenty-one million, two hundred ninety-seven thousand, nine hundred nineteen".