109991947 has 8 divisors (see below), whose sum is σ = 120076544. Its totient is φ = 100139328.

The previous prime is 109991933. The next prime is 109991977. The reversal of 109991947 is 749199901.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109991947 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 109991947.

It is not an unprimeable number, because it can be changed into a prime (109991927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57003 + ... + 58900.

It is an arithmetic number, because the mean of its divisors is an integer number (15009568).

Almost surely, 2^109991947 is an apocalyptic number.

109991947 is a deficient number, since it is larger than the sum of its proper divisors (10084597).

109991947 is a wasteful number, since it uses less digits than its factorization.

109991947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115989.

The product of its (nonzero) digits is 183708, while the sum is 49.

The square root of 109991947 is about 10487.7045629632. The cubic root of 109991947 is about 479.1302929045.

The spelling of 109991947 in words is "one hundred nine million, nine hundred ninety-one thousand, nine hundred forty-seven".