113887487981 has 2 divisors, whose sum is σ = 113887487982. Its totient is φ = 113887487980.

The previous prime is 113887487971. The next prime is 113887488007. The reversal of 113887487981 is 189784788311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59260112356 + 54627375625 = 243434^2 + 233725^2 .

It is a cyclic number.

It is not a de Polignac number, because 113887487981 - 2²² = 113883293677 is a prime.

It is a super-2 number, since 2×113887487981² (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 (113887487921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56943743990 + 56943743991.

It is an arithmetic number, because the mean of its divisors is an integer number (56943743991).

Almost surely, 2^113887487981 is an apocalyptic number.

It is an amenable number.

113887487981 is a deficient number, since it is larger than the sum of its proper divisors (1).

113887487981 is an equidigital number, since it uses as much as digits as its factorization.

113887487981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21676032, while the sum is 65.

The spelling of 113887487981 in words is "one hundred thirteen billion, eight hundred eighty-seven million, four hundred eighty-seven thousand, nine hundred eighty-one".