109699991 has 4 divisors (see below), whose sum is σ = 109722312. Its totient is φ = 109677672.

The previous prime is 109699943. The next prime is 109700023. The reversal of 109699991 is 199996901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199996901 = 13 ⋅15384377.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109699991 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 (109699921) 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, 200 + ... + 14813.

It is an arithmetic number, because the mean of its divisors is an integer number (27430578).

Almost surely, 2^109699991 is an apocalyptic number.

109699991 is a deficient number, since it is larger than the sum of its proper divisors (22321).

109699991 is an equidigital number, since it uses as much as digits as its factorization.

109699991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22320.

The product of its (nonzero) digits is 354294, while the sum is 53.

The square root of 109699991 is about 10473.7763485765. The cubic root of 109699991 is about 478.7059924054.

The spelling of 109699991 in words is "one hundred nine million, six hundred ninety-nine thousand, nine hundred ninety-one".