1365043561 has 8 divisors (see below), whose sum is σ = 1560332160. Its totient is φ = 1169825568.

The previous prime is 1365043501. The next prime is 1365043573. The reversal of 1365043561 is 1653405631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1365043561 - 2¹⁵ = 1365010793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1365043501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33780 + ... + 62218.

It is an arithmetic number, because the mean of its divisors is an integer number (195041520).

Almost surely, 2^1365043561 is an apocalyptic number.

It is an amenable number.

1365043561 is a deficient number, since it is larger than the sum of its proper divisors (195288599).

1365043561 is an equidigital number, since it uses as much as digits as its factorization.

1365043561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35303.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 1365043561 is about 36946.4959231589. The cubic root of 1365043561 is about 1109.2995502384.

The spelling of 1365043561 in words is "one billion, three hundred sixty-five million, forty-three thousand, five hundred sixty-one".