81428050271 has 8 divisors (see below), whose sum is σ = 83101140864. Its totient is φ = 79760023200.

The previous prime is 81428050259. The next prime is 81428050273. The reversal of 81428050271 is 17205082418.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81428050271 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 (81428050273) 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, 1233380 + ... + 1297721.

It is an arithmetic number, because the mean of its divisors is an integer number (10387642608).

Almost surely, 2^81428050271 is an apocalyptic number.

81428050271 is a deficient number, since it is larger than the sum of its proper divisors (1673090593).

81428050271 is a wasteful number, since it uses less digits than its factorization.

81428050271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2531761.

The product of its (nonzero) digits is 35840, while the sum is 38.

The spelling of 81428050271 in words is "eighty-one billion, four hundred twenty-eight million, fifty thousand, two hundred seventy-one".