1039871707081 has 3 divisors (see below), whose sum is σ = 1039872726823. Its totient is φ = 1039870687340.

The previous prime is 1039871707067. The next prime is 1039871707087. The reversal of 1039871707081 is 1807071789301.

It is a happy number.

The square root of 1039871707081 is 1019741.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 52193514681 + 987678192400 = 228459^2 + 993820^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1039871707081 is a prime.

It is a super-2 number, since 2×1039871707081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1039871707087) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 509871 + ... + 1529611.

Almost surely, 2^{1039871707081} is an apocalyptic number.

1039871707081 is the 1019741-st square number.

1039871707081 is the 509871-st centered octagonal number.

It is an amenable number.

1039871707081 is a deficient number, since it is larger than the sum of its proper divisors (1019742).

1039871707081 is an frugal number, since it uses more digits than its factorization.

1039871707081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2039482 (or 1019741 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 52.

The spelling of 1039871707081 in words is "one trillion, thirty-nine billion, eight hundred seventy-one million, seven hundred seven thousand, eighty-one".