19128061 has 4 divisors (see below), whose sum is σ = 19147612. Its totient is φ = 19108512.

The previous prime is 19128049. The next prime is 19128089. The reversal of 19128061 is 16082191.

It is a happy number.

It is the 1786-th star number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13032100 + 6095961 = 3610^2 + 2469^2 .

It is a cyclic number.

It is not a de Polignac number, because 19128061 - 2¹³ = 19119869 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 (19123061) 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 3 ways as a sum of consecutive naturals, for example, 8226 + ... + 10291.

It is an arithmetic number, because the mean of its divisors is an integer number (4786903).

Almost surely, 2^19128061 is an apocalyptic number.

It is an amenable number.

19128061 is a deficient number, since it is larger than the sum of its proper divisors (19551).

19128061 is a wasteful number, since it uses less digits than its factorization.

19128061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19550.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 19128061 is about 4373.5638785777. The cubic root of 19128061 is about 267.4383285785.

The spelling of 19128061 in words is "nineteen million, one hundred twenty-eight thousand, sixty-one".