1279813 has 2 divisors, whose sum is σ = 1279814. Its totient is φ = 1279812.

The previous prime is 1279807. The next prime is 1279819. The reversal of 1279813 is 3189721.

It is a balanced prime because it is at equal distance from previous prime (1279807) and next prime (1279819).

It can be written as a sum of positive squares in only one way, i.e., 986049 + 293764 = 993^2 + 542^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1279813 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1279819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639906 + 639907.

It is an arithmetic number, because the mean of its divisors is an integer number (639907).

2^1279813 is an apocalyptic number.

It is an amenable number.

1279813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279813 is an equidigital number, since it uses as much as digits as its factorization.

1279813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 31.

The square root of 1279813 is about 1131.2882037748. The cubic root of 1279813 is about 108.5714169470.

The spelling of 1279813 in words is "one million, two hundred seventy-nine thousand, eight hundred thirteen".