1561032563 has 8 divisors (see below), whose sum is σ = 1635724800. Its totient is φ = 1486908808.

The previous prime is 1561032541. The next prime is 1561032607. The reversal of 1561032563 is 3652301651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1561032563 - 2⁸ = 1561032307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561032163) 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 7 ways as a sum of consecutive naturals, for example, 136493 + ... + 147486.

It is an arithmetic number, because the mean of its divisors is an integer number (204465600).

Almost surely, 2^1561032563 is an apocalyptic number.

1561032563 is a deficient number, since it is larger than the sum of its proper divisors (74692237).

1561032563 is a wasteful number, since it uses less digits than its factorization.

1561032563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284241.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 1561032563 is about 39509.9046189686. The cubic root of 1561032563 is about 1160.0338285319.

The spelling of 1561032563 in words is "one billion, five hundred sixty-one million, thirty-two thousand, five hundred sixty-three".