109855987 has 2 divisors, whose sum is σ = 109855988. Its totient is φ = 109855986.

The previous prime is 109855961. The next prime is 109856003. The reversal of 109855987 is 789558901.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109855987 is a prime.

It is not a weakly prime, because it can be changed into another prime (109855387) 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, 54927993 + 54927994.

It is an arithmetic number, because the mean of its divisors is an integer number (54927994).

Almost surely, 2^109855987 is an apocalyptic number.

109855987 is a deficient number, since it is larger than the sum of its proper divisors (1).

109855987 is an equidigital number, since it uses as much as digits as its factorization.

109855987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 907200, while the sum is 52.

The square root of 109855987 is about 10481.2206827258. The cubic root of 109855987 is about 478.9327953739.

The spelling of 109855987 in words is "one hundred nine million, eight hundred fifty-five thousand, nine hundred eighty-seven".