1275779 has 2 divisors, whose sum is σ = 1275780. Its totient is φ = 1275778.

The previous prime is 1275751. The next prime is 1275803. The reversal of 1275779 is 9775721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1275779 - 2⁸ = 1275523 is a prime.

It is a super-2 number, since 2×1275779² = 3255224113682, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1275709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637889 + 637890.

It is an arithmetic number, because the mean of its divisors is an integer number (637890).

2^1275779 is an apocalyptic number.

1275779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275779 is an equidigital number, since it uses as much as digits as its factorization.

1275779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30870, while the sum is 38.

The square root of 1275779 is about 1129.5038733887. The cubic root of 1275779 is about 108.4572236821.

The spelling of 1275779 in words is "one million, two hundred seventy-five thousand, seven hundred seventy-nine".