81077271 has 16 divisors (see below), whose sum is σ = 118205568. Its totient is φ = 49023200.

The previous prime is 81077263. The next prime is 81077279. The reversal of 81077271 is 17277018.

It is an interprime number because it is at equal distance from previous prime (81077263) and next prime (81077279).

It is a cyclic number.

It is not a de Polignac number, because 81077271 - 2³ = 81077263 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81077279) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12781 + ... + 18041.

It is an arithmetic number, because the mean of its divisors is an integer number (7387848).

Almost surely, 2^81077271 is an apocalyptic number.

81077271 is a deficient number, since it is larger than the sum of its proper divisors (37128297).

81077271 is a wasteful number, since it uses less digits than its factorization.

81077271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5742.

The product of its (nonzero) digits is 5488, while the sum is 33.

The square root of 81077271 is about 9004.2918100204. The cubic root of 81077271 is about 432.8124126323.

It can be divided in two parts, 8 and 1077271, that multiplied together give a palindrome (8618168).

The spelling of 81077271 in words is "eighty-one million, seventy-seven thousand, two hundred seventy-one".