81469289053 has 2 divisors, whose sum is σ = 81469289054. Its totient is φ = 81469289052.

The previous prime is 81469288997. The next prime is 81469289059. The reversal of 81469289053 is 35098296418.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55216540324 + 26252748729 = 234982^2 + 162027^2 .

It is a cyclic number.

It is not a de Polignac number, because 81469289053 - 2²⁵ = 81435734621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81469288985 and 81469289003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81469289059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40734644526 + 40734644527.

It is an arithmetic number, because the mean of its divisors is an integer number (40734644527).

Almost surely, 2^81469289053 is an apocalyptic number.

It is an amenable number.

81469289053 is a deficient number, since it is larger than the sum of its proper divisors (1).

81469289053 is an equidigital number, since it uses as much as digits as its factorization.

81469289053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3732480, while the sum is 55.

The spelling of 81469289053 in words is "eighty-one billion, four hundred sixty-nine million, two hundred eighty-nine thousand, fifty-three".