109991979 has 32 divisors (see below), whose sum is σ = 167904000. Its totient is φ = 71124480.

The previous prime is 109991977. The next prime is 109992017. The reversal of 109991979 is 979199901.

It is not a de Polignac number, because 109991979 - 2¹ = 109991977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (109991977) 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 in 31 ways as a sum of consecutive naturals, for example, 244747 + ... + 245195.

It is an arithmetic number, because the mean of its divisors is an integer number (5247000).

Almost surely, 2^109991979 is an apocalyptic number.

109991979 is a deficient number, since it is larger than the sum of its proper divisors (57912021).

109991979 is a wasteful number, since it uses less digits than its factorization.

109991979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712 (or 706 counting only the distinct ones).

The product of its (nonzero) digits is 413343, while the sum is 54.

The square root of 109991979 is about 10487.7060885591. The cubic root of 109991979 is about 479.1303393691.

The spelling of 109991979 in words is "one hundred nine million, nine hundred ninety-one thousand, nine hundred seventy-nine".