1278148539 has 4 divisors (see below), whose sum is σ = 1704198056. Its totient is φ = 852099024.

The previous prime is 1278148517. The next prime is 1278148549. The reversal of 1278148539 is 9358418721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9358418721 = 3 ⋅3119472907.

It is not a de Polignac number, because 1278148539 - 2¹² = 1278144443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278148549) 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, 213024754 + ... + 213024759.

It is an arithmetic number, because the mean of its divisors is an integer number (426049514).

Almost surely, 2^1278148539 is an apocalyptic number.

1278148539 is a deficient number, since it is larger than the sum of its proper divisors (426049517).

1278148539 is an equidigital number, since it uses as much as digits as its factorization.

1278148539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426049516.

The product of its digits is 483840, while the sum is 48.

The square root of 1278148539 is about 35751.2033224058. The cubic root of 1278148539 is about 1085.2432900315.

The spelling of 1278148539 in words is "one billion, two hundred seventy-eight million, one hundred forty-eight thousand, five hundred thirty-nine".