561405291 has 8 divisors (see below), whose sum is σ = 765948480. Its totient is φ = 365566152.

The previous prime is 561405289. The next prime is 561405337. The reversal of 561405291 is 192504165.

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

It is not a de Polignac number, because 561405291 - 2¹ = 561405289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561405211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2175861 + ... + 2176118.

It is an arithmetic number, because the mean of its divisors is an integer number (95743560).

Almost surely, 2^561405291 is an apocalyptic number.

561405291 is a deficient number, since it is larger than the sum of its proper divisors (204543189).

561405291 is a wasteful number, since it uses less digits than its factorization.

561405291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4352025.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 561405291 is about 23693.9927196747. The cubic root of 561405291 is about 824.9459608314.

The spelling of 561405291 in words is "five hundred sixty-one million, four hundred five thousand, two hundred ninety-one".