109203531891 has 4 divisors (see below), whose sum is σ = 145604709192. Its totient is φ = 72802354592.

The previous prime is 109203531883. The next prime is 109203531919. The reversal of 109203531891 is 198135302901.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 109203531891 - 2³ = 109203531883 is a prime.

It is a super-2 number, since 2×109203531891² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (109203531991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18200588646 + ... + 18200588651.

It is an arithmetic number, because the mean of its divisors is an integer number (36401177298).

Almost surely, 2^109203531891 is an apocalyptic number.

109203531891 is a deficient number, since it is larger than the sum of its proper divisors (36401177301).

109203531891 is an equidigital number, since it uses as much as digits as its factorization.

109203531891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36401177300.

The product of its (nonzero) digits is 58320, while the sum is 42.

The spelling of 109203531891 in words is "one hundred nine billion, two hundred three million, five hundred thirty-one thousand, eight hundred ninety-one".