19891812053 has 2 divisors, whose sum is σ = 19891812054. Its totient is φ = 19891812052.

The previous prime is 19891812041. The next prime is 19891812089. The reversal of 19891812053 is 35021819891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13806720004 + 6085092049 = 117502^2 + 78007^2 .

It is a cyclic number.

It is not a de Polignac number, because 19891812053 - 2¹⁴ = 19891795669 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19891811989 and 19891812007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19891812023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9945906026 + 9945906027.

It is an arithmetic number, because the mean of its divisors is an integer number (9945906027).

Almost surely, 2^19891812053 is an apocalyptic number.

It is an amenable number.

19891812053 is a deficient number, since it is larger than the sum of its proper divisors (1).

19891812053 is an equidigital number, since it uses as much as digits as its factorization.

19891812053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 47.

The spelling of 19891812053 in words is "nineteen billion, eight hundred ninety-one million, eight hundred twelve thousand, fifty-three".