1340324261 has 4 divisors (see below), whose sum is σ = 1365613452. Its totient is φ = 1315035072.

The previous prime is 1340324257. The next prime is 1340324267. The reversal of 1340324261 is 1624230431.

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 1182947236 + 157377025 = 34394^2 + 12545^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340324261 - 2² = 1340324257 is a prime.

It is a super-2 number, since 2×1340324261² = 3592938249250392242, 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 1340324261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340324267) 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, 12644516 + ... + 12644621.

It is an arithmetic number, because the mean of its divisors is an integer number (341403363).

Almost surely, 2^1340324261 is an apocalyptic number.

It is an amenable number.

1340324261 is a deficient number, since it is larger than the sum of its proper divisors (25289191).

1340324261 is an equidigital number, since it uses as much as digits as its factorization.

1340324261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25289190.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 1340324261 is about 36610.4392352782. The cubic root of 1340324261 is about 1102.5626919512.

Adding to 1340324261 its reverse (1624230431), we get a palindrome (2964554692).

The spelling of 1340324261 in words is "one billion, three hundred forty million, three hundred twenty-four thousand, two hundred sixty-one".