19144921 has 2 divisors, whose sum is σ = 19144922. Its totient is φ = 19144920.

The previous prime is 19144903. The next prime is 19144963. The reversal of 19144921 is 12944191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15681600 + 3463321 = 3960^2 + 1861^2 .

It is a cyclic number.

It is not a de Polignac number, because 19144921 - 2⁵ = 19144889 is a prime.

It is not a weakly prime, because it can be changed into another prime (19144981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9572460 + 9572461.

It is an arithmetic number, because the mean of its divisors is an integer number (9572461).

Almost surely, 2^19144921 is an apocalyptic number.

It is an amenable number.

19144921 is a deficient number, since it is larger than the sum of its proper divisors (1).

19144921 is an equidigital number, since it uses as much as digits as its factorization.

19144921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 31.

The square root of 19144921 is about 4375.4909438828. The cubic root of 19144921 is about 267.5168813407.

The spelling of 19144921 in words is "nineteen million, one hundred forty-four thousand, nine hundred twenty-one".