19491055 has 16 divisors (see below), whose sum is σ = 24768000. Its totient is φ = 14683680.

The previous prime is 19491049. The next prime is 19491091. The reversal of 19491055 is 55019491.

It is a happy number.

It is not a de Polignac number, because 19491055 - 2³ = 19491047 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19491055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18390 + ... + 19420.

It is an arithmetic number, because the mean of its divisors is an integer number (1548000).

Almost surely, 2^19491055 is an apocalyptic number.

19491055 is a deficient number, since it is larger than the sum of its proper divisors (5276945).

19491055 is a wasteful number, since it uses less digits than its factorization.

19491055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1254.

The product of its (nonzero) digits is 8100, while the sum is 34.

The square root of 19491055 is about 4414.8674951803. The cubic root of 19491055 is about 269.1194680389.

The spelling of 19491055 in words is "nineteen million, four hundred ninety-one thousand, fifty-five".