1278251 has 4 divisors (see below), whose sum is σ = 1376592. Its totient is φ = 1179912.

The previous prime is 1278227. The next prime is 1278253. The reversal of 1278251 is 1528721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1278251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1278251.

It is not an unprimeable number, because it can be changed into a prime (1278253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49151 + ... + 49176.

It is an arithmetic number, because the mean of its divisors is an integer number (344148).

2^1278251 is an apocalyptic number.

1278251 is a deficient number, since it is larger than the sum of its proper divisors (98341).

1278251 is an equidigital number, since it uses as much as digits as its factorization.

1278251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98340.

The product of its digits is 1120, while the sum is 26.

The square root of 1278251 is about 1130.5976295747. The cubic root of 1278251 is about 108.5272288263.

The spelling of 1278251 in words is "one million, two hundred seventy-eight thousand, two hundred fifty-one".