1561267 has 2 divisors, whose sum is σ = 1561268. Its totient is φ = 1561266.

The previous prime is 1561247. The next prime is 1561279. The reversal of 1561267 is 7621651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1561267 - 2⁷ = 1561139 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1561247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780633 + 780634.

It is an arithmetic number, because the mean of its divisors is an integer number (780634).

2^1561267 is an apocalyptic number.

1561267 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561267 is an equidigital number, since it uses as much as digits as its factorization.

1561267 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 28.

The square root of 1561267 is about 1249.5067026631. The cubic root of 1561267 is about 116.0091897198.

The spelling of 1561267 in words is "one million, five hundred sixty-one thousand, two hundred sixty-seven".