109781791 has 16 divisors (see below), whose sum is σ = 136627200. Its totient is φ = 86069088.

The previous prime is 109781773. The next prime is 109781803. The reversal of 109781791 is 197187901.

It is not a de Polignac number, because 109781791 - 2⁷ = 109781663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109781491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10375 + ... + 18088.

It is an arithmetic number, because the mean of its divisors is an integer number (8539200).

Almost surely, 2^109781791 is an apocalyptic number.

109781791 is a deficient number, since it is larger than the sum of its proper divisors (26845409).

109781791 is a wasteful number, since it uses less digits than its factorization.

109781791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28518.

The product of its (nonzero) digits is 31752, while the sum is 43.

The square root of 109781791 is about 10477.6806116621. The cubic root of 109781791 is about 478.8249484200.

It can be divided in two parts, 10978 and 1791, that added together give a square (12769 = 113²).

The spelling of 109781791 in words is "one hundred nine million, seven hundred eighty-one thousand, seven hundred ninety-one".