81090927 has 6 divisors (see below), whose sum is σ = 117131352. Its totient is φ = 54060612.

The previous prime is 81090871. The next prime is 81090929. The reversal of 81090927 is 72909018.

It is a happy number.

It is not a de Polignac number, because 81090927 - 2⁸ = 81090671 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 81090891 and 81090900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81090929) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4505043 + ... + 4505060.

It is an arithmetic number, because the mean of its divisors is an integer number (19521892).

Almost surely, 2^81090927 is an apocalyptic number.

81090927 is a deficient number, since it is larger than the sum of its proper divisors (36040425).

81090927 is a wasteful number, since it uses less digits than its factorization.

81090927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9010109 (or 9010106 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 81090927 is about 9005.0500831478. The cubic root of 81090927 is about 432.8367110760.

The spelling of 81090927 in words is "eighty-one million, ninety thousand, nine hundred twenty-seven".