1321321249 has 4 divisors (see below), whose sum is σ = 1321406100. Its totient is φ = 1321236400.

The previous prime is 1321321231. The next prime is 1321321259. The reversal of 1321321249 is 9421231231.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 971444224 + 349877025 = 31168^2 + 18705^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321321249 - 2¹¹ = 1321319201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321321219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11602 + ... + 52699.

It is an arithmetic number, because the mean of its divisors is an integer number (330351525).

Almost surely, 2^1321321249 is an apocalyptic number.

It is an amenable number.

1321321249 is a deficient number, since it is larger than the sum of its proper divisors (84851).

1321321249 is an equidigital number, since it uses as much as digits as its factorization.

1321321249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84850.

The product of its digits is 2592, while the sum is 28.

The square root of 1321321249 is about 36349.9827922930. The cubic root of 1321321249 is about 1097.3271881952.

The spelling of 1321321249 in words is "one billion, three hundred twenty-one million, three hundred twenty-one thousand, two hundred forty-nine".