109825991 has 8 divisors (see below), whose sum is σ = 119965968. Its totient is φ = 99712000.

The previous prime is 109825979. The next prime is 109825993. The reversal of 109825991 is 199528901.

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 not a de Polignac number, because 109825991 - 2⁶ = 109825927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109825993) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2951 + ... + 15111.

It is an arithmetic number, because the mean of its divisors is an integer number (14995746).

Almost surely, 2^109825991 is an apocalyptic number.

109825991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

109825991 is a deficient number, since it is larger than the sum of its proper divisors (10139977).

109825991 is a wasteful number, since it uses less digits than its factorization.

109825991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12993.

The product of its (nonzero) digits is 58320, while the sum is 44.

The square root of 109825991 is about 10479.7896448354. The cubic root of 109825991 is about 478.8892007968.

The spelling of 109825991 in words is "one hundred nine million, eight hundred twenty-five thousand, nine hundred ninety-one".