1266761 has 2 divisors, whose sum is σ = 1266762. Its totient is φ = 1266760.

The previous prime is 1266757. The next prime is 1266763. The reversal of 1266761 is 1676621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 883600 + 383161 = 940^2 + 619^2 .

It is an emirp because it is prime and its reverse (1676621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1266761 - 2² = 1266757 is a prime.

It is a super-2 number, since 2×1266761² = 3209366862242, which contains 22 as substring.

Together with 1266763, 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 (1266763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633380 + 633381.

It is an arithmetic number, because the mean of its divisors is an integer number (633381).

2^1266761 is an apocalyptic number.

It is an amenable number.

1266761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266761 is an equidigital number, since it uses as much as digits as its factorization.

1266761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 29.

The square root of 1266761 is about 1125.5047756451. The cubic root of 1266761 is about 108.2010714631.

The spelling of 1266761 in words is "one million, two hundred sixty-six thousand, seven hundred sixty-one".