1010999995981 has 2 divisors, whose sum is σ = 1010999995982. Its totient is φ = 1010999995980.

The previous prime is 1010999995961. The next prime is 1010999996009. The reversal of 1010999995981 is 1895999990101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 675863207881 + 335136788100 = 822109^2 + 578910^2 .

It is a cyclic number.

It is not a de Polignac number, because 1010999995981 - 2⁷ = 1010999995853 is a prime.

It is a super-2 number, since 2×1010999995981² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1010999995981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1010999995921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505499997990 + 505499997991.

It is an arithmetic number, because the mean of its divisors is an integer number (505499997991).

Almost surely, 2^{1010999995981} is an apocalyptic number.

It is an amenable number.

1010999995981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1010999995981 is an equidigital number, since it uses as much as digits as its factorization.

1010999995981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21257640, while the sum is 70.

The spelling of 1010999995981 in words is "one trillion, ten billion, nine hundred ninety-nine million, nine hundred ninety-five thousand, nine hundred eighty-one".