109187831 has 4 divisors (see below), whose sum is σ = 113935152. Its totient is φ = 104440512.

The previous prime is 109187803. The next prime is 109187843. The reversal of 109187831 is 138781901.

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 109187831 - 2¹⁰ = 109186807 is a prime.

It is a super-2 number, since 2×109187831² = 23843964876969122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109187861) 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 3 ways as a sum of consecutive naturals, for example, 2373626 + ... + 2373671.

It is an arithmetic number, because the mean of its divisors is an integer number (28483788).

Almost surely, 2^109187831 is an apocalyptic number.

109187831 is a deficient number, since it is larger than the sum of its proper divisors (4747321).

109187831 is an equidigital number, since it uses as much as digits as its factorization.

109187831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4747320.

The product of its (nonzero) digits is 12096, while the sum is 38.

The square root of 109187831 is about 10449.2981103996. The cubic root of 109187831 is about 477.9598464780.

The spelling of 109187831 in words is "one hundred nine million, one hundred eighty-seven thousand, eight hundred thirty-one".