16109491 has 8 divisors (see below), whose sum is σ = 16688000. Its totient is φ = 15534720.

The previous prime is 16109479. The next prime is 16109501. The reversal of 16109491 is 19490161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16109491 - 2⁵ = 16109459 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16109441) 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, 10075 + ... + 11563.

It is an arithmetic number, because the mean of its divisors is an integer number (2086000).

Almost surely, 2^16109491 is an apocalyptic number.

16109491 is a deficient number, since it is larger than the sum of its proper divisors (578509).

16109491 is a wasteful number, since it uses less digits than its factorization.

16109491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1869.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 16109491 is about 4013.6630401667. The cubic root of 16109491 is about 252.5576955371.

The spelling of 16109491 in words is "sixteen million, one hundred nine thousand, four hundred ninety-one".