81280187243 has 8 divisors (see below), whose sum is σ = 81807034320. Its totient is φ = 80753456160.

The previous prime is 81280187237. The next prime is 81280187269. The reversal of 81280187243 is 34278108218.

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 81280187243 - 2⁴ = 81280187227 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81280187194 and 81280187203.

It is not an unprimeable number, because it can be changed into a prime (81280187293) 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, 1714448 + ... + 1761218.

It is an arithmetic number, because the mean of its divisors is an integer number (10225879290).

Almost surely, 2^81280187243 is an apocalyptic number.

81280187243 is a deficient number, since it is larger than the sum of its proper divisors (526847077).

81280187243 is a wasteful number, since it uses less digits than its factorization.

81280187243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57997.

The product of its (nonzero) digits is 172032, while the sum is 44.

The spelling of 81280187243 in words is "eighty-one billion, two hundred eighty million, one hundred eighty-seven thousand, two hundred forty-three".