111787681 has 2 divisors, whose sum is σ = 111787682. Its totient is φ = 111787680.

The previous prime is 111787673. The next prime is 111787703. The reversal of 111787681 is 186787111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105760656 + 6027025 = 10284^2 + 2455^2 .

It is a cyclic number.

It is not a de Polignac number, because 111787681 - 2³ = 111787673 is a prime.

It is a super-2 number, since 2×111787681² = 24992971246715522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111787661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55893840 + 55893841.

It is an arithmetic number, because the mean of its divisors is an integer number (55893841).

Almost surely, 2^111787681 is an apocalyptic number.

It is an amenable number.

111787681 is a deficient number, since it is larger than the sum of its proper divisors (1).

111787681 is an equidigital number, since it uses as much as digits as its factorization.

111787681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18816, while the sum is 40.

The square root of 111787681 is about 10572.9693558621. The cubic root of 111787681 is about 481.7236655181.

The spelling of 111787681 in words is "one hundred eleven million, seven hundred eighty-seven thousand, six hundred eighty-one".