109997491905 has 24 divisors (see below), whose sum is σ = 217899794112. Its totient is φ = 50284567584.

The previous prime is 109997491897. The next prime is 109997491931. The reversal of 109997491905 is 509194799901.

It is not a de Polignac number, because 109997491905 - 2³ = 109997491897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 174598879 + ... + 174599508.

It is an arithmetic number, because the mean of its divisors is an integer number (9079158088).

Almost surely, 2^109997491905 is an apocalyptic number.

109997491905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

109997491905 is a deficient number, since it is larger than the sum of its proper divisors (107902302207).

109997491905 is a wasteful number, since it uses less digits than its factorization.

109997491905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349198405 (or 349198402 counting only the distinct ones).

The product of its (nonzero) digits is 8266860, while the sum is 63.

The spelling of 109997491905 in words is "one hundred nine billion, nine hundred ninety-seven million, four hundred ninety-one thousand, nine hundred five".