1279561 has 2 divisors, whose sum is σ = 1279562. Its totient is φ = 1279560.

The previous prime is 1279549. The next prime is 1279583. The reversal of 1279561 is 1659721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1279161 + 400 = 1131^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 1279561 - 2¹⁷ = 1148489 is a prime.

1279561 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1279511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639780 + 639781.

It is an arithmetic number, because the mean of its divisors is an integer number (639781).

2^1279561 is an apocalyptic number.

It is an amenable number.

1279561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279561 is an equidigital number, since it uses as much as digits as its factorization.

1279561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 31.

The square root of 1279561 is about 1131.1768208375. The cubic root of 1279561 is about 108.5642904389.

The spelling of 1279561 in words is "one million, two hundred seventy-nine thousand, five hundred sixty-one".