1278538839097 has 8 divisors (see below), whose sum is σ = 1377006260616. Its totient is φ = 1180088314752.

The previous prime is 1278538839077. The next prime is 1278538839101. The reversal of 1278538839097 is 7909388358721.

It can be written as a sum of positive squares in 4 ways, for example, as 291574080576 + 986964758521 = 539976^2 + 993461^2 .

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 1278538839097 - 2¹¹ = 1278538837049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278538839077) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4066918 + ... + 4369999.

It is an arithmetic number, because the mean of its divisors is an integer number (172125782577).

Almost surely, 2^{1278538839097} is an apocalyptic number.

It is an amenable number.

1278538839097 is a deficient number, since it is larger than the sum of its proper divisors (98467421519).

1278538839097 is a wasteful number, since it uses less digits than its factorization.

1278538839097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8448587.

The product of its (nonzero) digits is 182891520, while the sum is 70.

The spelling of 1278538839097 in words is "one trillion, two hundred seventy-eight billion, five hundred thirty-eight million, eight hundred thirty-nine thousand, ninety-seven".