81090831026 has 8 divisors (see below), whose sum is σ = 121638329004. Its totient is φ = 40544721360.

The previous prime is 81090831023. The next prime is 81090831047. The reversal of 81090831026 is 62013809018.

It can be written as a sum of positive squares in 2 ways, for example, as 69176890225 + 11913940801 = 263015^2 + 109151^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81090831023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186125 + ... + 443648.

Almost surely, 2^81090831026 is an apocalyptic number.

81090831026 is a deficient number, since it is larger than the sum of its proper divisors (40547497978).

81090831026 is a wasteful number, since it uses less digits than its factorization.

81090831026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694156.

The product of its (nonzero) digits is 20736, while the sum is 38.

The spelling of 81090831026 in words is "eighty-one billion, ninety million, eight hundred thirty-one thousand, twenty-six".