81871174 has 16 divisors (see below), whose sum is σ = 153110016. Its totient is φ = 31897800.

The previous prime is 81871169. The next prime is 81871193. The reversal of 81871174 is 47117818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265662 + ... + 265969.

It is an arithmetic number, because the mean of its divisors is an integer number (9569376).

Almost surely, 2^81871174 is an apocalyptic number.

81871174 is a deficient number, since it is larger than the sum of its proper divisors (71238842).

81871174 is a wasteful number, since it uses less digits than its factorization.

81871174 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531651.

The product of its digits is 12544, while the sum is 37.

The square root of 81871174 is about 9048.2691162454. The cubic root of 81871174 is about 434.2205162500.

The spelling of 81871174 in words is "eighty-one million, eight hundred seventy-one thousand, one hundred seventy-four".