1275878145 has 8 divisors (see below), whose sum is σ = 2041405056. Its totient is φ = 680468336.

The previous prime is 1275878143. The next prime is 1275878147. The reversal of 1275878145 is 5418785721.

It is an interprime number because it is at equal distance from previous prime (1275878143) and next prime (1275878147).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1275878145 - 2¹ = 1275878143 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1275878094 and 1275878103.

It is not an unprimeable number, because it can be changed into a prime (1275878143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42529257 + ... + 42529286.

It is an arithmetic number, because the mean of its divisors is an integer number (255175632).

Almost surely, 2^1275878145 is an apocalyptic number.

1275878145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1275878145 is a deficient number, since it is larger than the sum of its proper divisors (765526911).

1275878145 is an equidigital number, since it uses as much as digits as its factorization.

1275878145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85058551.

The product of its digits is 627200, while the sum is 48.

The square root of 1275878145 is about 35719.4365157123. The cubic root of 1275878145 is about 1084.6003313233.

It can be divided in two parts, 12758781 and 45, that added together give a triangular number (12758826 = T₅₀₅₁).

The spelling of 1275878145 in words is "one billion, two hundred seventy-five million, eight hundred seventy-eight thousand, one hundred forty-five".