1340366521 has 4 divisors (see below), whose sum is σ = 1443471652. Its totient is φ = 1237261392.

The previous prime is 1340366519. The next prime is 1340366593. The reversal of 1340366521 is 1256630431.

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 401802025 + 938564496 = 20045^2 + 30636^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340366521 - 2¹ = 1340366519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1340366221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51552546 + ... + 51552571.

It is an arithmetic number, because the mean of its divisors is an integer number (360867913).

Almost surely, 2^1340366521 is an apocalyptic number.

It is an amenable number.

1340366521 is a deficient number, since it is larger than the sum of its proper divisors (103105131).

1340366521 is a wasteful number, since it uses less digits than its factorization.

1340366521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103105130.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 1340366521 is about 36611.0163885134. The cubic root of 1340366521 is about 1102.5742796470.

Adding to 1340366521 its reverse (1256630431), we get a palindrome (2596996952).

The spelling of 1340366521 in words is "one billion, three hundred forty million, three hundred sixty-six thousand, five hundred twenty-one".