109644991 has 4 divisors (see below), whose sum is σ = 115415800. Its totient is φ = 103874184.

The previous prime is 109644989. The next prime is 109645001. The reversal of 109644991 is 199446901.

It is a happy number.

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 109644991 - 2¹ = 109644989 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 (109644901) 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, 2885376 + ... + 2885413.

It is an arithmetic number, because the mean of its divisors is an integer number (28853950).

Almost surely, 2^109644991 is an apocalyptic number.

109644991 is a deficient number, since it is larger than the sum of its proper divisors (5770809).

109644991 is an equidigital number, since it uses as much as digits as its factorization.

109644991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5770808.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 109644991 is about 10471.1504143528. The cubic root of 109644991 is about 478.6259765041.

The spelling of 109644991 in words is "one hundred nine million, six hundred forty-four thousand, nine hundred ninety-one".