561393947 has 4 divisors (see below), whose sum is σ = 569300976. Its totient is φ = 553486920.

The previous prime is 561393929. The next prime is 561393949. The reversal of 561393947 is 749393165.

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

It is a cyclic number.

It is not a de Polignac number, because 561393947 - 2²⁶ = 494285083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561393949) 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, 3953408 + ... + 3953549.

It is an arithmetic number, because the mean of its divisors is an integer number (142325244).

Almost surely, 2^561393947 is an apocalyptic number.

561393947 is a deficient number, since it is larger than the sum of its proper divisors (7907029).

561393947 is an equidigital number, since it uses as much as digits as its factorization.

561393947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7907028.

The product of its digits is 612360, while the sum is 47.

The square root of 561393947 is about 23693.7533328935. The cubic root of 561393947 is about 824.9404043881.

The spelling of 561393947 in words is "five hundred sixty-one million, three hundred ninety-three thousand, nine hundred forty-seven".