19491066 has 24 divisors (see below), whose sum is σ = 48263904. Its totient is φ = 5568840.

The previous prime is 19491049. The next prime is 19491091. The reversal of 19491066 is 66019491.

It is a self number, because there is not a number n which added to its sum of digits gives 19491066.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77220 + ... + 77471.

It is an arithmetic number, because the mean of its divisors is an integer number (2010996).

Almost surely, 2^19491066 is an apocalyptic number.

19491066 is an abundant number, since it is smaller than the sum of its proper divisors (28772838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19491066 is a wasteful number, since it uses less digits than its factorization.

19491066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154706 (or 154703 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 19491066 is about 4414.8687409707. The cubic root of 19491066 is about 269.1195186658.

The spelling of 19491066 in words is "nineteen million, four hundred ninety-one thousand, sixty-six".