81171026 has 16 divisors (see below), whose sum is σ = 123492600. Its totient is φ = 40009728.

The previous prime is 81170987. The next prime is 81171031. The reversal of 81171026 is 62017118.

It can be written as a sum of positive squares in 4 ways, for example, as 58599025 + 22572001 = 7655^2 + 4751^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81170986 and 81171004.

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, 105170 + ... + 105938.

Almost surely, 2^81171026 is an apocalyptic number.

81171026 is a deficient number, since it is larger than the sum of its proper divisors (42321574).

81171026 is a wasteful number, since it uses less digits than its factorization.

81171026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 81171026 is about 9009.4964343186. The cubic root of 81171026 is about 432.9791782217.

The spelling of 81171026 in words is "eighty-one million, one hundred seventy-one thousand, twenty-six".