106805891 has 2 divisors, whose sum is σ = 106805892. Its totient is φ = 106805890.

The previous prime is 106805837. The next prime is 106805903. The reversal of 106805891 is 198508601.

It is a strong prime.

It is an emirp because it is prime and its reverse (198508601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 106805891 - 2¹⁸ = 106543747 is a prime.

It is a super-2 number, since 2×106805891² = 22814996704607762, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (106805191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53402945 + 53402946.

It is an arithmetic number, because the mean of its divisors is an integer number (53402946).

Almost surely, 2^106805891 is an apocalyptic number.

106805891 is a deficient number, since it is larger than the sum of its proper divisors (1).

106805891 is an equidigital number, since it uses as much as digits as its factorization.

106805891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 106805891 is about 10334.6935610109. The cubic root of 106805891 is about 474.4586867665.

The spelling of 106805891 in words is "one hundred six million, eight hundred five thousand, eight hundred ninety-one".