561306783 has 4 divisors (see below), whose sum is σ = 748409048. Its totient is φ = 374204520.

The previous prime is 561306701. The next prime is 561306847. The reversal of 561306783 is 387603165.

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

It is not a de Polignac number, because 561306783 - 2²⁰ = 560258207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561306583) 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 3 ways as a sum of consecutive naturals, for example, 93551128 + ... + 93551133.

It is an arithmetic number, because the mean of its divisors is an integer number (187102262).

Almost surely, 2^561306783 is an apocalyptic number.

561306783 is a deficient number, since it is larger than the sum of its proper divisors (187102265).

561306783 is a wasteful number, since it uses less digits than its factorization.

561306783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187102264.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 561306783 is about 23691.9138737249. The cubic root of 561306783 is about 824.8977077948.

The spelling of 561306783 in words is "five hundred sixty-one million, three hundred six thousand, seven hundred eighty-three".