1275749 has 2 divisors, whose sum is σ = 1275750. Its totient is φ = 1275748.

The previous prime is 1275737. The next prime is 1275751. The reversal of 1275749 is 9475721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 664225 + 611524 = 815^2 + 782^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1275749 is a prime.

It is a super-2 number, since 2×1275749² = 3255071022002, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 1275751, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1275709) 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, 637874 + 637875.

It is an arithmetic number, because the mean of its divisors is an integer number (637875).

2^1275749 is an apocalyptic number.

It is an amenable number.

1275749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275749 is an equidigital number, since it uses as much as digits as its factorization.

1275749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17640, while the sum is 35.

The square root of 1275749 is about 1129.4905931437. The cubic root of 1275749 is about 108.4563735499.

The spelling of 1275749 in words is "one million, two hundred seventy-five thousand, seven hundred forty-nine".