81376871 has 16 divisors (see below), whose sum is σ = 86400000. Its totient is φ = 76529376.

The previous prime is 81376861. The next prime is 81376877. The reversal of 81376871 is 17867318.

It is a de Polignac number, because none of the positive numbers 2^k-81376871 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 (81376877) 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, 340370 + ... + 340608.

It is an arithmetic number, because the mean of its divisors is an integer number (5400000).

Almost surely, 2^81376871 is an apocalyptic number.

81376871 is a deficient number, since it is larger than the sum of its proper divisors (5023129).

81376871 is a wasteful number, since it uses less digits than its factorization.

81376871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526.

The product of its digits is 56448, while the sum is 41.

The square root of 81376871 is about 9020.9129804028. The cubic root of 81376871 is about 433.3448726053.

The spelling of 81376871 in words is "eighty-one million, three hundred seventy-six thousand, eight hundred seventy-one".