1261279 has 2 divisors, whose sum is σ = 1261280. Its totient is φ = 1261278.

The previous prime is 1261261. The next prime is 1261289. The reversal of 1261279 is 9721621.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1261279 - 2⁹ = 1260767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630639 + 630640.

It is an arithmetic number, because the mean of its divisors is an integer number (630640).

2^1261279 is an apocalyptic number.

1261279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261279 is an equidigital number, since it uses as much as digits as its factorization.

1261279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 28.

The square root of 1261279 is about 1123.0667834105. The cubic root of 1261279 is about 108.0447631087.

It can be divided in two parts, 1261 and 279, that added together give a triangular number (1540 = T₅₅).

The spelling of 1261279 in words is "one million, two hundred sixty-one thousand, two hundred seventy-nine".