561038905 has 32 divisors (see below), whose sum is σ = 784143360. Its totient is φ = 377403840.

The previous prime is 561038903. The next prime is 561038911. The reversal of 561038905 is 509830165.

It is not a de Polignac number, because 561038905 - 2¹ = 561038903 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (561038903) 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 31 ways as a sum of consecutive naturals, for example, 982270 + ... + 982840.

It is an arithmetic number, because the mean of its divisors is an integer number (24504480).

Almost surely, 2^561038905 is an apocalyptic number.

It is an amenable number.

561038905 is a deficient number, since it is larger than the sum of its proper divisors (223104455).

561038905 is a wasteful number, since it uses less digits than its factorization.

561038905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 561038905 is about 23686.2598356093. The cubic root of 561038905 is about 824.7664622107.

It can be divided in two parts, 56 and 1038905, that added together give a triangular number (1038961 = T₁₄₄₁).

The spelling of 561038905 in words is "five hundred sixty-one million, thirty-eight thousand, nine hundred five".