1266491 has 2 divisors, whose sum is σ = 1266492. Its totient is φ = 1266490.

The previous prime is 1266487. The next prime is 1266493. The reversal of 1266491 is 1946621.

It is a strong prime.

It is an emirp because it is prime and its reverse (1946621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1266491 - 2² = 1266487 is a prime.

Together with 1266493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1266493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633245 + 633246.

It is an arithmetic number, because the mean of its divisors is an integer number (633246).

2^1266491 is an apocalyptic number.

1266491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266491 is an equidigital number, since it uses as much as digits as its factorization.

1266491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 1266491 is about 1125.3848230716. The cubic root of 1266491 is about 108.1933835185.

The spelling of 1266491 in words is "one million, two hundred sixty-six thousand, four hundred ninety-one".