105566891 has 2 divisors, whose sum is σ = 105566892. Its totient is φ = 105566890.

The previous prime is 105566843. The next prime is 105566893. The reversal of 105566891 is 198665501.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 105566891 - 2¹⁸ = 105304747 is a prime.

It is a super-2 number, since 2×105566891² = 22288736950811762, which contains 22 as substring.

Together with 105566893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (105566893) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52783445 + 52783446.

It is an arithmetic number, because the mean of its divisors is an integer number (52783446).

Almost surely, 2^105566891 is an apocalyptic number.

105566891 is a deficient number, since it is larger than the sum of its proper divisors (1).

105566891 is an equidigital number, since it uses as much as digits as its factorization.

105566891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 105566891 is about 10274.5749790441. The cubic root of 105566891 is about 472.6168963222.

The spelling of 105566891 in words is "one hundred five million, five hundred sixty-six thousand, eight hundred ninety-one".