1078878993581 has 2 divisors, whose sum is σ = 1078878993582. Its totient is φ = 1078878993580.

The previous prime is 1078878993557. The next prime is 1078878993589. The reversal of 1078878993581 is 1853998788701.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1078878993481 + 100 = 1038691^2 + 10^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1078878993581 is a prime.

It is a super-3 number, since 3×1078878993581³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 1078878993499 and 1078878993508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1078878993589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539439496790 + 539439496791.

It is an arithmetic number, because the mean of its divisors is an integer number (539439496791).

Almost surely, 2^{1078878993581} is an apocalyptic number.

It is an amenable number.

1078878993581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1078878993581 is an equidigital number, since it uses as much as digits as its factorization.

1078878993581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 243855360, while the sum is 74.

The spelling of 1078878993581 in words is "one trillion, seventy-eight billion, eight hundred seventy-eight million, nine hundred ninety-three thousand, five hundred eighty-one".