100038785981 has 2 divisors, whose sum is σ = 100038785982. Its totient is φ = 100038785980.

The previous prime is 100038785969. The next prime is 100038785999. The reversal of 100038785981 is 189587830001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83873952100 + 16164833881 = 289610^2 + 127141^2 .

It is an emirp because it is prime and its reverse (189587830001) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100038785981 is a prime.

It is a super-2 number, since 2×100038785981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100038785281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50019392990 + 50019392991.

It is an arithmetic number, because the mean of its divisors is an integer number (50019392991).

Almost surely, 2^100038785981 is an apocalyptic number.

It is an amenable number.

100038785981 is a deficient number, since it is larger than the sum of its proper divisors (1).

100038785981 is an equidigital number, since it uses as much as digits as its factorization.

100038785981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 50.

The spelling of 100038785981 in words is "one hundred billion, thirty-eight million, seven hundred eighty-five thousand, nine hundred eighty-one".