81089384293 has 4 divisors (see below), whose sum is σ = 81092108128. Its totient is φ = 81086660460.

The previous prime is 81089384281. The next prime is 81089384339. The reversal of 81089384293 is 39248398018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81089384293 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 (81089384393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1316763 + ... + 1376968.

It is an arithmetic number, because the mean of its divisors is an integer number (20273027032).

Almost surely, 2^81089384293 is an apocalyptic number.

It is an amenable number.

81089384293 is a deficient number, since it is larger than the sum of its proper divisors (2723835).

81089384293 is a wasteful number, since it uses less digits than its factorization.

81089384293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2723834.

The product of its (nonzero) digits is 2985984, while the sum is 55.

The spelling of 81089384293 in words is "eighty-one billion, eighty-nine million, three hundred eighty-four thousand, two hundred ninety-three".