19621093 has 4 divisors (see below), whose sum is σ = 20474208. Its totient is φ = 18767980.

The previous prime is 19621087. The next prime is 19621103. The reversal of 19621093 is 39012691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19621093 - 2⁵ = 19621061 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19621033) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 426523 + ... + 426568.

It is an arithmetic number, because the mean of its divisors is an integer number (5118552).

Almost surely, 2^19621093 is an apocalyptic number.

It is an amenable number.

19621093 is a deficient number, since it is larger than the sum of its proper divisors (853115).

19621093 is an equidigital number, since it uses as much as digits as its factorization.

19621093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853114.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 19621093 is about 4429.5702951867. The cubic root of 19621093 is about 269.7166345817.

The spelling of 19621093 in words is "nineteen million, six hundred twenty-one thousand, ninety-three".