19073521 has 2 divisors, whose sum is σ = 19073522. Its totient is φ = 19073520.

The previous prime is 19073519. The next prime is 19073533. The reversal of 19073521 is 12537091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14145121 + 4928400 = 3761^2 + 2220^2 .

It is a cyclic number.

It is not a de Polignac number, because 19073521 - 2¹ = 19073519 is a prime.

Together with 19073519, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 19073521.

It is not a weakly prime, because it can be changed into another prime (19073581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9536760 + 9536761.

It is an arithmetic number, because the mean of its divisors is an integer number (9536761).

Almost surely, 2^19073521 is an apocalyptic number.

It is an amenable number.

19073521 is a deficient number, since it is larger than the sum of its proper divisors (1).

19073521 is an equidigital number, since it uses as much as digits as its factorization.

19073521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 19073521 is about 4367.3242380203. The cubic root of 19073521 is about 267.1839035641.

The spelling of 19073521 in words is "nineteen million, seventy-three thousand, five hundred twenty-one".