1365647345 has 4 divisors (see below), whose sum is σ = 1638776820. Its totient is φ = 1092517872.

The previous prime is 1365647341. The next prime is 1365647351. The reversal of 1365647345 is 5437465631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5437465631 = 13 ⋅418266587.

It can be written as a sum of positive squares in 2 ways, for example, as 867420304 + 498227041 = 29452^2 + 22321^2 .

It is a cyclic number.

It is not a de Polignac number, because 1365647345 - 2² = 1365647341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1365647296 and 1365647305.

It is not an unprimeable number, because it can be changed into a prime (1365647341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136564730 + ... + 136564739.

It is an arithmetic number, because the mean of its divisors is an integer number (409694205).

Almost surely, 2^1365647345 is an apocalyptic number.

It is an amenable number.

1365647345 is a deficient number, since it is larger than the sum of its proper divisors (273129475).

1365647345 is an equidigital number, since it uses as much as digits as its factorization.

1365647345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273129474.

The product of its digits is 907200, while the sum is 44.

The square root of 1365647345 is about 36954.6660788594. Note that the first 3 decimals coincide. The cubic root of 1365647345 is about 1109.4630806955.

The spelling of 1365647345 in words is "one billion, three hundred sixty-five million, six hundred forty-seven thousand, three hundred forty-five".