1561065 has 16 divisors (see below), whose sum is σ = 2725056. Its totient is φ = 756800.

The previous prime is 1561039. The next prime is 1561069. The reversal of 1561065 is 5601651.

It is not a de Polignac number, because 1561065 - 2¹¹ = 1559017 is a prime.

1561065 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1561069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4566 + ... + 4895.

It is an arithmetic number, because the mean of its divisors is an integer number (170316).

2^1561065 is an apocalyptic number.

1561065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1561065 is a deficient number, since it is larger than the sum of its proper divisors (1163991).

1561065 is a wasteful number, since it uses less digits than its factorization.

1561065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9480.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1561065 is about 1249.4258681490. The cubic root of 1561065 is about 116.0041863333.

It can be divided in two parts, 156 and 1065, that added together give a palindrome (1221).

The spelling of 1561065 in words is "one million, five hundred sixty-one thousand, sixty-five".