105138781 has 8 divisors (see below), whose sum is σ = 114829344. Its totient is φ = 95470320.

The previous prime is 105138757. The next prime is 105138797. The reversal of 105138781 is 187831501.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 105138781 - 2¹⁷ = 105007709 is a prime.

It is a super-2 number, since 2×105138781² = 22108326540331922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105138751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5371 + ... + 15463.

It is an arithmetic number, because the mean of its divisors is an integer number (14353668).

Almost surely, 2^105138781 is an apocalyptic number.

105138781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

105138781 is a deficient number, since it is larger than the sum of its proper divisors (9690563).

105138781 is a wasteful number, since it uses less digits than its factorization.

105138781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11051.

The product of its (nonzero) digits is 6720, while the sum is 34.

The square root of 105138781 is about 10253.7203492196. The cubic root of 105138781 is about 471.9771561409.

The spelling of 105138781 in words is "one hundred five million, one hundred thirty-eight thousand, seven hundred eighty-one".