1565961 has 16 divisors (see below), whose sum is σ = 2231040. Its totient is φ = 974160.

The previous prime is 1565947. The next prime is 1565969. The reversal of 1565961 is 1695651.

It is not a de Polignac number, because 1565961 - 2⁵ = 1565929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1565969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4566 + ... + 4896.

It is an arithmetic number, because the mean of its divisors is an integer number (139440).

2^1565961 is an apocalyptic number.

It is an amenable number.

1565961 is a deficient number, since it is larger than the sum of its proper divisors (665079).

1565961 is a wasteful number, since it uses less digits than its factorization.

1565961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436.

The product of its digits is 8100, while the sum is 33.

The square root of 1565961 is about 1251.3836342225. The cubic root of 1565961 is about 116.1253351994.

The spelling of 1565961 in words is "one million, five hundred sixty-five thousand, nine hundred sixty-one".