1559561 has 4 divisors (see below), whose sum is σ = 1627392. Its totient is φ = 1491732.

The previous prime is 1559549. The next prime is 1559573. The reversal of 1559561 is 1659551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1559549) and next prime (1559573).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1559561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1559521) 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, 33881 + ... + 33926.

It is an arithmetic number, because the mean of its divisors is an integer number (406848).

2^1559561 is an apocalyptic number.

It is an amenable number.

1559561 is a deficient number, since it is larger than the sum of its proper divisors (67831).

1559561 is an equidigital number, since it uses as much as digits as its factorization.

1559561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67830.

The product of its digits is 6750, while the sum is 32.

The square root of 1559561 is about 1248.8238466653. The cubic root of 1559561 is about 115.9669198182.

The spelling of 1559561 in words is "one million, five hundred fifty-nine thousand, five hundred sixty-one".