81098074989 has 32 divisors (see below), whose sum is σ = 123196550400. Its totient is φ = 52694910720.

The previous prime is 81098074973. The next prime is 81098075053. The reversal of 81098074989 is 98947089018.

It is not a de Polignac number, because 81098074989 - 2⁴ = 81098074973 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81098074789) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1108072 + ... + 1178990.

It is an arithmetic number, because the mean of its divisors is an integer number (3849892200).

Almost surely, 2^81098074989 is an apocalyptic number.

It is an amenable number.

81098074989 is a deficient number, since it is larger than the sum of its proper divisors (42098475411).

81098074989 is a wasteful number, since it uses less digits than its factorization.

81098074989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72002 (or 71996 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 63.

The spelling of 81098074989 in words is "eighty-one billion, ninety-eight million, seventy-four thousand, nine hundred eighty-nine".