1013171156981 has 2 divisors, whose sum is σ = 1013171156982. Its totient is φ = 1013171156980.

The previous prime is 1013171156971. The next prime is 1013171157007. The reversal of 1013171156981 is 1896511713101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 861351048100 + 151820108881 = 928090^2 + 389641^2 .

It is a cyclic number.

It is not a de Polignac number, because 1013171156981 - 2¹⁰ = 1013171155957 is a prime.

It is a super-2 number, since 2×1013171156981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1013171156971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506585578490 + 506585578491.

It is an arithmetic number, because the mean of its divisors is an integer number (506585578491).

Almost surely, 2^{1013171156981} is an apocalyptic number.

It is an amenable number.

1013171156981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1013171156981 is an equidigital number, since it uses as much as digits as its factorization.

1013171156981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 44.

The spelling of 1013171156981 in words is "one trillion, thirteen billion, one hundred seventy-one million, one hundred fifty-six thousand, nine hundred eighty-one".