81589029369 has 16 divisors (see below), whose sum is σ = 115209434112. Its totient is φ = 51251249808.

The previous prime is 81589029329. The next prime is 81589029377. The reversal of 81589029369 is 96392098518.

It is a happy number.

It is not a de Polignac number, because 81589029369 - 2¹³ = 81589021177 is a prime.

It is a super-2 number, since 2×81589029369² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81589029329) 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 in 15 ways as a sum of consecutive naturals, for example, 8819629 + ... + 8828874.

It is an arithmetic number, because the mean of its divisors is an integer number (7200589632).

Almost surely, 2^81589029369 is an apocalyptic number.

It is an amenable number.

81589029369 is a deficient number, since it is larger than the sum of its proper divisors (33620404743).

81589029369 is a wasteful number, since it uses less digits than its factorization.

81589029369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17648596.

The product of its (nonzero) digits is 8398080, while the sum is 60.

The spelling of 81589029369 in words is "eighty-one billion, five hundred eighty-nine million, twenty-nine thousand, three hundred sixty-nine".