1078725869981 has 4 divisors (see below), whose sum is σ = 1088272116732. Its totient is φ = 1069179623232.

The previous prime is 1078725869971. The next prime is 1078725869987. The reversal of 1078725869981 is 1899685278701.

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

It can be written as a sum of positive squares in 2 ways, for example, as 157720973881 + 921004896100 = 397141^2 + 959690^2 .

It is a cyclic number.

It is not a de Polignac number, because 1078725869981 - 2³⁴ = 1061546000797 is a prime.

It is a super-2 number, since 2×1078725869981² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1078725869987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4773123206 + ... + 4773123431.

It is an arithmetic number, because the mean of its divisors is an integer number (272068029183).

Almost surely, 2^{1078725869981} is an apocalyptic number.

It is an amenable number.

1078725869981 is a deficient number, since it is larger than the sum of its proper divisors (9546246751).

1078725869981 is an equidigital number, since it uses as much as digits as its factorization.

1078725869981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9546246750.

The product of its (nonzero) digits is 121927680, while the sum is 71.

The spelling of 1078725869981 in words is "one trillion, seventy-eight billion, seven hundred twenty-five million, eight hundred sixty-nine thousand, nine hundred eighty-one".