561278365 has 8 divisors (see below), whose sum is σ = 673709400. Its totient is φ = 448905792.

The previous prime is 561278353. The next prime is 561278401. The reversal of 561278365 is 563872165.

It can be written as a sum of positive squares in 4 ways, for example, as 199289689 + 361988676 = 14117^2 + 19026^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 561278365 - 2⁹ = 561277853 is a prime.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10407 + ... + 35083.

It is an arithmetic number, because the mean of its divisors is an integer number (84213675).

Almost surely, 2^561278365 is an apocalyptic number.

It is an amenable number.

561278365 is a deficient number, since it is larger than the sum of its proper divisors (112431035).

561278365 is a wasteful number, since it uses less digits than its factorization.

561278365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29231.

The product of its digits is 302400, while the sum is 43.

The square root of 561278365 is about 23691.3141256453. The cubic root of 561278365 is about 824.8837865076.

The spelling of 561278365 in words is "five hundred sixty-one million, two hundred seventy-eight thousand, three hundred sixty-five".