81871295 has 16 divisors (see below), whose sum is σ = 107442720. Its totient is φ = 59395200.

The previous prime is 81871267. The next prime is 81871297. The reversal of 81871295 is 59217818.

It is a de Polignac number, because none of the positive numbers 2^k-81871295 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81871297) 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, 23741 + ... + 26969.

It is an arithmetic number, because the mean of its divisors is an integer number (6715170).

Almost surely, 2^81871295 is an apocalyptic number.

81871295 is a deficient number, since it is larger than the sum of its proper divisors (25571425).

81871295 is a wasteful number, since it uses less digits than its factorization.

81871295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3706.

The product of its digits is 40320, while the sum is 41.

The square root of 81871295 is about 9048.2758026046. The cubic root of 81871295 is about 434.2207301660.

The spelling of 81871295 in words is "eighty-one million, eight hundred seventy-one thousand, two hundred ninety-five".