105563781 has 6 divisors (see below), whose sum is σ = 152481030. Its totient is φ = 70375848.

The previous prime is 105563771. The next prime is 105563789. The reversal of 105563781 is 187365501.

105563781 is a `hidden beast` number, since 10 + 5 + 5 + 637 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 54154881 + 51408900 = 7359^2 + 7170^2 .

It is not a de Polignac number, because 105563781 - 2⁵ = 105563749 is a prime.

It is a super-2 number, since 2×105563781² = 22287423718031922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105563789) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5864646 + ... + 5864663.

It is an arithmetic number, because the mean of its divisors is an integer number (25413505).

Almost surely, 2^105563781 is an apocalyptic number.

It is an amenable number.

105563781 is a deficient number, since it is larger than the sum of its proper divisors (46917249).

105563781 is a wasteful number, since it uses less digits than its factorization.

105563781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11729315 (or 11729312 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 105563781 is about 10274.4236334697. The cubic root of 105563781 is about 472.6122551796.

The spelling of 105563781 in words is "one hundred five million, five hundred sixty-three thousand, seven hundred eighty-one".