109861643 has 2 divisors, whose sum is σ = 109861644. Its totient is φ = 109861642.

The previous prime is 109861627. The next prime is 109861669. The reversal of 109861643 is 346168901.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 109861643 - 2⁴ = 109861627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 109861597 and 109861606.

It is not a weakly prime, because it can be changed into another prime (109861693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54930821 + 54930822.

It is an arithmetic number, because the mean of its divisors is an integer number (54930822).

Almost surely, 2^109861643 is an apocalyptic number.

109861643 is a deficient number, since it is larger than the sum of its proper divisors (1).

109861643 is an equidigital number, since it uses as much as digits as its factorization.

109861643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 109861643 is about 10481.4904951538. The cubic root of 109861643 is about 478.9410146116.

The spelling of 109861643 in words is "one hundred nine million, eight hundred sixty-one thousand, six hundred forty-three".