561278 has 4 divisors (see below), whose sum is σ = 841920. Its totient is φ = 280638.

The previous prime is 561277. The next prime is 561307. The reversal of 561278 is 872165.

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

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

It is a self number, because there is not a number n which added to its sum of digits gives 561278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140318 + ... + 140321.

It is an arithmetic number, because the mean of its divisors is an integer number (210480).

2⁵⁶¹²⁷⁸ is an apocalyptic number.

561278 is a deficient number, since it is larger than the sum of its proper divisors (280642).

561278 is a wasteful number, since it uses less digits than its factorization.

561278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280641.

The product of its digits is 3360, while the sum is 29.

The square root of 561278 is about 749.1848903976. The cubic root of 561278 is about 82.4883607700.

The spelling of 561278 in words is "five hundred sixty-one thousand, two hundred seventy-eight".