19036943521 has 2 divisors, whose sum is σ = 19036943522. Its totient is φ = 19036943520.

The previous prime is 19036943477. The next prime is 19036943561. The reversal of 19036943521 is 12534963091.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18554526225 + 482417296 = 136215^2 + 21964^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19036943521 is a prime.

It is not a weakly prime, because it can be changed into another prime (19036943561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9518471760 + 9518471761.

It is an arithmetic number, because the mean of its divisors is an integer number (9518471761).

Almost surely, 2^19036943521 is an apocalyptic number.

It is an amenable number.

19036943521 is a deficient number, since it is larger than the sum of its proper divisors (1).

19036943521 is an equidigital number, since it uses as much as digits as its factorization.

19036943521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 43.

The spelling of 19036943521 in words is "nineteen billion, thirty-six million, nine hundred forty-three thousand, five hundred twenty-one".