1278151 has 4 divisors (see below), whose sum is σ = 1460752. Its totient is φ = 1095552.

The previous prime is 1278139. The next prime is 1278163. The reversal of 1278151 is 1518721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1518721 = 31 ⋅48991.

It is an interprime number because it is at equal distance from previous prime (1278139) and next prime (1278163).

It is a cyclic number.

It is not a de Polignac number, because 1278151 - 2¹¹ = 1276103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278131) 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, 91290 + ... + 91303.

It is an arithmetic number, because the mean of its divisors is an integer number (365188).

2^1278151 is an apocalyptic number.

1278151 is a deficient number, since it is larger than the sum of its proper divisors (182601).

1278151 is an equidigital number, since it uses as much as digits as its factorization.

1278151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182600.

The product of its digits is 560, while the sum is 25.

The square root of 1278151 is about 1130.5534043114. The cubic root of 1278151 is about 108.5243986555.

The spelling of 1278151 in words is "one million, two hundred seventy-eight thousand, one hundred fifty-one".