1291567 has 2 divisors, whose sum is σ = 1291568. Its totient is φ = 1291566.

The previous prime is 1291547. The next prime is 1291579. The reversal of 1291567 is 7651921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1291567 - 2¹⁹ = 767279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291547) 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, 645783 + 645784.

It is an arithmetic number, because the mean of its divisors is an integer number (645784).

2^1291567 is an apocalyptic number.

1291567 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291567 is an equidigital number, since it uses as much as digits as its factorization.

1291567 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 1291567 is about 1136.4712930822. The cubic root of 1291567 is about 108.9027834476.

The spelling of 1291567 in words is "one million, two hundred ninety-one thousand, five hundred sixty-seven".