1261567 has 2 divisors, whose sum is σ = 1261568. Its totient is φ = 1261566.

The previous prime is 1261549. The next prime is 1261571. The reversal of 1261567 is 7651621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1261567 - 2¹⁹ = 737279 is a prime.

It is equal to p₉₇₂₉₁ and since 1261567 and 97291 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1268567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630783 + 630784.

It is an arithmetic number, because the mean of its divisors is an integer number (630784).

2^1261567 is an apocalyptic number.

1261567 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261567 is an equidigital number, since it uses as much as digits as its factorization.

1261567 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 1261567 is about 1123.1949964276. The cubic root of 1261567 is about 108.0529861172.

The spelling of 1261567 in words is "one million, two hundred sixty-one thousand, five hundred sixty-seven".