81271098 has 24 divisors (see below), whose sum is σ = 183744288. Its totient is φ = 25912392.

The previous prime is 81271063. The next prime is 81271111. The reversal of 81271098 is 89017218.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97740 + ... + 98567.

It is an arithmetic number, because the mean of its divisors is an integer number (7656012).

Almost surely, 2^81271098 is an apocalyptic number.

81271098 is an abundant number, since it is smaller than the sum of its proper divisors (102473190).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81271098 is a wasteful number, since it uses less digits than its factorization.

81271098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196338 (or 196335 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 81271098 is about 9015.0484191711. The cubic root of 81271098 is about 433.1570384776.

The spelling of 81271098 in words is "eighty-one million, two hundred seventy-one thousand, ninety-eight".