105851381 has 4 divisors (see below), whose sum is σ = 108433164. Its totient is φ = 103269600.

The previous prime is 105851377. The next prime is 105851393. The reversal of 105851381 is 183158501.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16851025 + 89000356 = 4105^2 + 9434^2 .

It is a cyclic number.

It is not a de Polignac number, because 105851381 - 2² = 105851377 is a prime.

It is a super-2 number, since 2×105851381² = 22409029719214322, 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 (105851321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1290830 + ... + 1290911.

It is an arithmetic number, because the mean of its divisors is an integer number (27108291).

Almost surely, 2^105851381 is an apocalyptic number.

It is an amenable number.

105851381 is a deficient number, since it is larger than the sum of its proper divisors (2581783).

105851381 is an equidigital number, since it uses as much as digits as its factorization.

105851381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581782.

The product of its (nonzero) digits is 4800, while the sum is 32.

The square root of 105851381 is about 10288.4100326532. The cubic root of 105851381 is about 473.0410639764.

The spelling of 105851381 in words is "one hundred five million, eight hundred fifty-one thousand, three hundred eighty-one".