561278339 has 2 divisors, whose sum is σ = 561278340. Its totient is φ = 561278338.

The previous prime is 561278329. The next prime is 561278353. The reversal of 561278339 is 933872165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561278339 - 2¹² = 561274243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561278339.

It is not a weakly prime, because it can be changed into another prime (561278329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280639169 + 280639170.

It is an arithmetic number, because the mean of its divisors is an integer number (280639170).

Almost surely, 2^561278339 is an apocalyptic number.

561278339 is a deficient number, since it is larger than the sum of its proper divisors (1).

561278339 is an equidigital number, since it uses as much as digits as its factorization.

561278339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 44.

The square root of 561278339 is about 23691.3135769210. The cubic root of 561278339 is about 824.8837737706.

The spelling of 561278339 in words is "five hundred sixty-one million, two hundred seventy-eight thousand, three hundred thirty-nine".