1340305531 has 4 divisors (see below), whose sum is σ = 1340388432. Its totient is φ = 1340222632.

The previous prime is 1340305523. The next prime is 1340305573. The reversal of 1340305531 is 1355030431.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1355030431 = 1823 ⋅743297.

It is a cyclic number.

It is not a de Polignac number, because 1340305531 - 2³ = 1340305523 is a prime.

It is a super-2 number, since 2×1340305531² = 3592837832858383922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1340305496 and 1340305505.

It is not an unprimeable number, because it can be changed into a prime (1340305831) 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, 8431 + ... + 52456.

It is an arithmetic number, because the mean of its divisors is an integer number (335097108).

Almost surely, 2^1340305531 is an apocalyptic number.

1340305531 is a deficient number, since it is larger than the sum of its proper divisors (82901).

1340305531 is an equidigital number, since it uses as much as digits as its factorization.

1340305531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82900.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 1340305531 is about 36610.1834330286. The cubic root of 1340305531 is about 1102.5575561055.

Adding to 1340305531 its reverse (1355030431), we get a palindrome (2695335962).

The spelling of 1340305531 in words is "one billion, three hundred forty million, three hundred five thousand, five hundred thirty-one".