81089384291 has 8 divisors (see below), whose sum is σ = 82657608624. Its totient is φ = 79536167200.

The previous prime is 81089384281. The next prime is 81089384339. The reversal of 81089384291 is 19248398018.

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 81089384291 - 2²² = 81085189987 is a prime.

It is a super-3 number, since 3×81089384291³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81089384231) 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, 3740900 + ... + 3762513.

It is an arithmetic number, because the mean of its divisors is an integer number (10332201078).

Almost surely, 2^81089384291 is an apocalyptic number.

81089384291 is a deficient number, since it is larger than the sum of its proper divisors (1568224333).

81089384291 is a wasteful number, since it uses less digits than its factorization.

81089384291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7503621.

The product of its (nonzero) digits is 995328, while the sum is 53.

The spelling of 81089384291 in words is "eighty-one billion, eighty-nine million, three hundred eighty-four thousand, two hundred ninety-one".