109491887 has 4 divisors (see below), whose sum is σ = 109654296. Its totient is φ = 109329480.

The previous prime is 109491871. The next prime is 109491911. The reversal of 109491887 is 788194901.

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 109491887 - 2⁴ = 109491871 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 (109491817) 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, 80189 + ... + 81542.

It is an arithmetic number, because the mean of its divisors is an integer number (27413574).

Almost surely, 2^109491887 is an apocalyptic number.

109491887 is a deficient number, since it is larger than the sum of its proper divisors (162409).

109491887 is an equidigital number, since it uses as much as digits as its factorization.

109491887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162408.

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 109491887 is about 10463.8371069125. The cubic root of 109491887 is about 478.4030944993.

The spelling of 109491887 in words is "one hundred nine million, four hundred ninety-one thousand, eight hundred eighty-seven".