1561279 has 2 divisors, whose sum is σ = 1561280. Its totient is φ = 1561278.

The previous prime is 1561267. The next prime is 1561303. The reversal of 1561279 is 9721651.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1561279 - 2⁵ = 1561247 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1561279.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1561579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780639 + 780640.

It is an arithmetic number, because the mean of its divisors is an integer number (780640).

2^1561279 is an apocalyptic number.

1561279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561279 is an equidigital number, since it uses as much as digits as its factorization.

1561279 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 1561279 is about 1249.5115045489. The cubic root of 1561279 is about 116.0094869371.

The spelling of 1561279 in words is "one million, five hundred sixty-one thousand, two hundred seventy-nine".