1559963561 has 4 divisors (see below), whose sum is σ = 1679960772. Its totient is φ = 1439966352.

The previous prime is 1559963557. The next prime is 1559963567. The reversal of 1559963561 is 1653699551.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 545923225 + 1014040336 = 23365^2 + 31844^2 .

It is a cyclic number.

It is not a de Polignac number, because 1559963561 - 2² = 1559963557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1559963567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59998586 + ... + 59998611.

It is an arithmetic number, because the mean of its divisors is an integer number (419990193).

Almost surely, 2^1559963561 is an apocalyptic number.

It is an amenable number.

1559963561 is a deficient number, since it is larger than the sum of its proper divisors (119997211).

1559963561 is a wasteful number, since it uses less digits than its factorization.

1559963561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119997210.

The product of its digits is 1093500, while the sum is 50.

The square root of 1559963561 is about 39496.3740234468. The cubic root of 1559963561 is about 1159.7689692991.

The spelling of 1559963561 in words is "one billion, five hundred fifty-nine million, nine hundred sixty-three thousand, five hundred sixty-one".