1565013361 has 4 divisors (see below), whose sum is σ = 1565099172. Its totient is φ = 1564927552.

The previous prime is 1565013349. The next prime is 1565013397. The reversal of 1565013361 is 1633105651.

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: 1633105651 = 19 ⋅85952929.

It can be written as a sum of positive squares in 2 ways, for example, as 218123361 + 1346890000 = 14769^2 + 36700^2 .

It is a cyclic number.

It is not a de Polignac number, because 1565013361 - 2²³ = 1556624753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1565013301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3460 + ... + 56053.

It is an arithmetic number, because the mean of its divisors is an integer number (391274793).

Almost surely, 2^1565013361 is an apocalyptic number.

It is an amenable number.

1565013361 is a deficient number, since it is larger than the sum of its proper divisors (85811).

1565013361 is an equidigital number, since it uses as much as digits as its factorization.

1565013361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85810.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 1565013361 is about 39560.2497590700. The cubic root of 1565013361 is about 1161.0190611405.

The spelling of 1565013361 in words is "one billion, five hundred sixty-five million, thirteen thousand, three hundred sixty-one".