1251279 has 12 divisors (see below), whose sum is σ = 1852032. Its totient is φ = 813600.

The previous prime is 1251259. The next prime is 1251287. The reversal of 1251279 is 9721521.

It is not a de Polignac number, because 1251279 - 2⁵ = 1251247 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251259) 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 in 11 ways as a sum of consecutive naturals, for example, 1327 + ... + 2064.

It is an arithmetic number, because the mean of its divisors is an integer number (154336).

2^1251279 is an apocalyptic number.

1251279 is a deficient number, since it is larger than the sum of its proper divisors (600753).

1251279 is a wasteful number, since it uses less digits than its factorization.

1251279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3438 (or 3435 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 1251279 is about 1118.6058286993. The cubic root of 1251279 is about 107.7584622707.

The spelling of 1251279 in words is "one million, two hundred fifty-one thousand, two hundred seventy-nine".