561279783 has 4 divisors (see below), whose sum is σ = 748373048. Its totient is φ = 374186520.

The previous prime is 561279773. The next prime is 561279793. The reversal of 561279783 is 387972165.

561279783 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (561279773) and next prime (561279793).

It is not a de Polignac number, because 561279783 - 2⁸ = 561279527 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 (561279773) 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, 93546628 + ... + 93546633.

It is an arithmetic number, because the mean of its divisors is an integer number (187093262).

Almost surely, 2^561279783 is an apocalyptic number.

561279783 is a deficient number, since it is larger than the sum of its proper divisors (187093265).

561279783 is a wasteful number, since it uses less digits than its factorization.

561279783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187093264.

The product of its digits is 635040, while the sum is 48.

The square root of 561279783 is about 23691.3440522061. The cubic root of 561279783 is about 824.8844811625.

The spelling of 561279783 in words is "five hundred sixty-one million, two hundred seventy-nine thousand, seven hundred eighty-three".