81120328997 has 8 divisors (see below), whose sum is σ = 83076830496. Its totient is φ = 79167008592.

The previous prime is 81120328979. The next prime is 81120329023. The reversal of 81120328997 is 79982302118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81120328997 - 2¹⁰ = 81120327973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81120328957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 743618 + ... + 845699.

It is an arithmetic number, because the mean of its divisors is an integer number (10384603812).

Almost surely, 2^81120328997 is an apocalyptic number.

It is an amenable number.

81120328997 is a deficient number, since it is larger than the sum of its proper divisors (1956501499).

81120328997 is a wasteful number, since it uses less digits than its factorization.

81120328997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590547.

The product of its (nonzero) digits is 435456, while the sum is 50.

The spelling of 81120328997 in words is "eighty-one billion, one hundred twenty million, three hundred twenty-eight thousand, nine hundred ninety-seven".